{
  "manageEntity": {
    "action": "Save",
    "entityId": "50649370",
    "entityType": "Track",
    "nonce": "1793810673598666666",
    "signature": "0xe0580bb03fc0d8850cdef508793bd81e93e13071393928c0dd68f7075e99a07e0039bcce66317ff64a12083a4d2ea2086a705c2bd1e8376d515d5ee900b9b7691b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}