{
  "manageEntity": {
    "action": "Save",
    "entityId": "266653",
    "entityType": "Track",
    "nonce": "0x7ef7ffd08987b3066c9a62d6a9055da2604fb902d4c7755ceca7645e5792a243",
    "signature": "0x4dc9331fd4ab890ca5d01448bbda21908c88efa9e4d5ba19d778eb2e90d0f5265d7462b2d4fe6b123247f85d7d230656fefd7876aa40fbe17b42ac78cdaf3ae81b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}