{
  "manageEntity": {
    "action": "Save",
    "entityId": "554488",
    "entityType": "Track",
    "nonce": "0x842367d17f14f75aea21289f0303ce574a39bdbb5128b8074e923990e66323be",
    "signature": "0xed7753711ffbedd0d1de7c43a1a6645bbc7c5192fb22a1dca41e31f9f9704ee765406747ceaa052fe80dc07bb62dbe852d63a513b2b5f79c1f835a30fc6d68391c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}