{
  "manageEntity": {
    "action": "Save",
    "entityId": "619462",
    "entityType": "Track",
    "nonce": "0x3a7e4f119d26a01e05ff1b54b2b561b8f373ca73d6073dc8bd935ec288e50d02",
    "signature": "0xa7b5cfe8d3b68eb6f908aea3295a6b3c3ee332b164187184eba1879938992d365d38ec2bfe2462f362e2e87fd1286b1c1a8224afcf49ed9dde70f5bbba23937b1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}