{
  "manageEntity": {
    "action": "Save",
    "entityId": "445825623",
    "entityType": "Track",
    "nonce": "0xea3db7b26b690f63693afd9ada135ce999edaf7b152bc2ea3e8ab04295c86060",
    "signature": "0x51c7b9b14cb50af6847a657beb821cd76d899d06d01c12833b2fea6aedeb5dc647e7d01bb5276b0aad92bdd8df9c3ee1c6df7a56672dc551d74408638b7ad0921c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}