{
  "manageEntity": {
    "action": "Save",
    "entityId": "250019551",
    "entityType": "Track",
    "nonce": "1793018933355116772",
    "signature": "0x6d9ac3099a8b021020950f936011396b8db38187b5952abe29a474fd1b4538d97287c658ede934993487599ed72db86ba3a15f2348995f5a6d6d143819a2e42a1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}