{
  "manageEntity": {
    "action": "Save",
    "entityId": "17874",
    "entityType": "Track",
    "nonce": "0xf4c0681645aaf66f05ca61a9acc7010302c09a36cb206b27307e8a144c042b9f",
    "signature": "0x2a5eff0806482e14e634ee5deacdb3e1e334f7c06fe7d5717b8fc604e34d2ef5012cdbc6d4957ace0b70012c9a0d28eb5db6f8bb35763efc95c12cd09efdd8241b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}