{
  "manageEntity": {
    "action": "Save",
    "entityId": "544073",
    "entityType": "Track",
    "nonce": "0xf67fed9fecf6fb818b3daff657b28a87f76e73a8770061ed7d9d9f447f88f1ce",
    "signature": "0x558377a8e5a2db204f8bd73b125a2468f242f1fa4f99a9fbafa6a4c568a114883ba4142cc918e11950f51a3a3a2ce5e3e4a5146d05e9ce9f680e4f96feb2bfaa1c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}