{
  "manageEntity": {
    "action": "Save",
    "entityId": "1609113543",
    "entityType": "Track",
    "nonce": "0x2b1df45285249cab42913d63510c8ea25a88a88f81993cd83a5d7330fd655232",
    "signature": "0xb33eeefdfbaf76155d445efce3c06a2a27f63af47e9d9a171a2a94de8912c4f16cb5538ed44078f59ce45ab4cc783583932b5e0f0b6fb7c66566756ceb89d5171b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}