{
  "manageEntity": {
    "action": "Save",
    "entityId": "558249234",
    "entityType": "Track",
    "nonce": "0x59dcaa27ae903b13e1f96c0a781185e9874b7695240a5809c0db68474ab833a6",
    "signature": "0x4a200219d04bcc0f2b91d9132b21a0cfb82d3881f0556e51fe2d605c017b71605f4350d96e862143bce964196efff9c2a7a54a83121495bda73de2f64f05340d1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}