{
  "manageEntity": {
    "action": "Save",
    "entityId": "1762867615",
    "entityType": "Track",
    "nonce": "1787520590682450542",
    "signature": "0xb0535da339065c00147a39c41499b277bd5aa19b0258f6d7779388389305e09171cd576de47e6e20f206d246f01a9761c9ac995cfbc8a65ccc9956a5ea3e4c841c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}