{
  "manageEntity": {
    "action": "Save",
    "entityId": "577886869",
    "entityType": "Track",
    "nonce": "0xfc4f120a3d857a46e8eb3b59f0077dc161a0a5b527ba59339da8298d0ec811c7",
    "signature": "0xb597708159130ff6cb7a6574bf940e8eb6d5635e73309a4cf347fc61f953424358cfc4f9e183c645bf0bbce0f8e1306998d38bc9361f24b47775bc7dfb984a721b",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}