{
  "manageEntity": {
    "action": "Save",
    "entityId": "590655",
    "entityType": "Track",
    "nonce": "0xe0d3bd761a42a5f6511f4cc34e146b98d54f3863a77a86c309be0856e1f94f1a",
    "signature": "0xdb4d6b92765a4be8883e0e265f83c266372c10995aee46ccc7bc1fc7e3e920f31ca3111783aa3adc826f02c076f01755a56e58bdce6ca27dbf14e47cce51c6da1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}