{
  "manageEntity": {
    "action": "Save",
    "entityId": "303758391",
    "entityType": "Track",
    "nonce": "0x63492370a45bba200a3e5224406c137814e6ccb9f4394914365f36146a66d0ac",
    "signature": "0x45ba48b8ef7c6748b61424366d157d4add663202f486cddfa985a6ba076615052b88b37249da5a4731fc30933d6d9fa3790566254607445f19ee49928271ae0c1b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}