{
  "manageEntity": {
    "action": "Save",
    "entityId": "527144784",
    "entityType": "Track",
    "nonce": "0x4fcf580dbd8a0f0c9d05418161214716b0a235a297f41e288644654ddd08c0c4",
    "signature": "0xcb07f136ec46a5cfa7157bb02237c123a885baa5eb932ebf2c8c3fda2e9f5e28655b39b0e0e4d377938ac1f42b700f4016a8eb0ffd064eeb9f6e7c44eef6aecf1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}