{
  "manageEntity": {
    "action": "Save",
    "entityId": "1509393753",
    "entityType": "Track",
    "nonce": "0x6c213d8c1c3ea183055d8c33c95733ea89c2a90d8315a73778aea8fcd6634116",
    "signature": "0xc04ba5adf6bf033f070d1e119ce3a89c6f142853af6f641eaa65d701dae233d24da6eba3cda253dfefaccfc2d409f1d495ef955e89630ff7d8b2c9d32fa91c481c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}