{
  "manageEntity": {
    "action": "Save",
    "entityId": "604108",
    "entityType": "Track",
    "nonce": "0xcc0be595c08bf6e72a67ba4f7992f9408ea517f535f2713031e34642ffe7318d",
    "signature": "0x405f6add93cb19e52bdb794e1453653f0ed83048b8428b5facf9a140e99051285c93676c5b5579c6476a7271a5069db0236a1cfd272ffb4edb5d2bbbd7d664961c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}