{
  "manageEntity": {
    "action": "Save",
    "entityId": "1970880837",
    "entityType": "Track",
    "nonce": "0x23a76ecd4b94e4adf67a434472fd03de73f7b088bc11650fb54787b023a94958",
    "signature": "0xf816a318980d4fb70cdbccfeecb3b762bda822a90b3c1bfa9a48cce32e87cef22beb36b933e0d4a1736a6b68b9a3e2f02db3c56e54ccbd77593e784e6be38d961c",
    "signer": "0x5D4848bCf5c4abA1a0Fdf2B61408c9e4288aDb0E",
    "userId": "305415280"
  }
}