{
  "manageEntity": {
    "action": "Save",
    "entityId": "1277154981",
    "entityType": "Track",
    "nonce": "0xc0b0219b7c3ccdef55f585c3216003080b6a8d8fe570165751a4460be526b0f4",
    "signature": "0x36b15a05b86154e815de63a066e8679e628b211be9d71bfe02732db19c6042a22fb75130acaa8423ca4d749d64456d59d287e0fe0aaa3ea52830620ad9861ff21b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}