{
  "manageEntity": {
    "action": "Save",
    "entityId": "1999135900",
    "entityType": "Track",
    "nonce": "0xf9672af9f7048fcf76ae3250dcd987c1339f358f3a5d8bc974d1dab42bf40acb",
    "signature": "0x8d9433e3c83432a3f963f0d8b6b714bf4bc6569d8ae9534d45038f892b5afadc18ddc5fcad5f99d8a48fc9215baf4b68c84a935239985d4523270a909db9f2de1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}