{
  "manageEntity": {
    "action": "Save",
    "entityId": "487771062",
    "entityType": "Track",
    "nonce": "0xc88cc78cebcbb8281bc0ff780f80abc97773419aa5b80c37e43cb2d7741fec86",
    "signature": "0xf71deabf26bddf96a47eb91072691769a589efe07e8839c5433c33c4df90029b46d680b3a8ca75fa8e58819eb1a2998eea144609b933614e2084aa6f2fe799b91c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}