{
  "manageEntity": {
    "action": "Save",
    "entityId": "369883019",
    "entityType": "Track",
    "nonce": "0xe1d7f88529a19626ffc0a9befa30f61009d96fb887124907576bf8d1acb7a4e5",
    "signature": "0x6188c903fb2c692a990cb9eb4bfb15dc0780fc7142fa9224513a79c6c9325c605c49cb132c8eed0b5318fcdbfc4448a3a8d002e05fa55c009f86e5dde0e14ec51c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}