{
  "manageEntity": {
    "action": "Save",
    "entityId": "389745599",
    "entityType": "Track",
    "nonce": "0x2a741c1fe6c961accab3dd97af333c071e65361b88b99448d2e400be0ba2690f",
    "signature": "0x46ce9245020414b6c2de2e4655c3ef1069a830cf6ce13d952772cd7e4335131c3b00fc03d3375d43eeb984868e1c076e95e56072a8706dbd68db0e3c5efc48a11b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}