{
  "manageEntity": {
    "action": "Save",
    "entityId": "439389728",
    "entityType": "Track",
    "nonce": "0xef0687bdb35e993c17c4b68b9e09ba614af52ab5cc34fd8caceb4ec29aed004a",
    "signature": "0x8800e7927088dc7ac05c3bf0f7c29425d6481be53fff4e12b210883a33ccc252251ec2c6550ce2783467a8766b7a2b55ff02651eb33ce7952e7fc061ef1f52f31c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}