{
  "manageEntity": {
    "action": "Save",
    "entityId": "454389",
    "entityType": "Track",
    "nonce": "0x283835a9efe6b7d197f69cd33362f3c25ec2d41fda0ea050cfd262682cab324d",
    "signature": "0x098aa154e566cd19dbed5aa1341b6d8d94ca87f2bec68dfed88db6bc6b6aedc63b48fb5bbd65ccf4be07c2b8bf213898f6b3ed086a919dd9105e01bc7031223d1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}