{
  "manageEntity": {
    "action": "Save",
    "entityId": "1263180722",
    "entityType": "Track",
    "nonce": "0x4d981da84d18e5a2d4a98ce53a80fe6d5d85d68e7f3cbc3d04284592dae89a1a",
    "signature": "0xc6dd86b646ed84ff2895a50c4dc288541c1d124378a2bda36b6dca2263b2c508048bab00a9610523ec2c1415ada694c59068c6d693e95577365b783a75cc03711b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}