{
  "manageEntity": {
    "action": "Save",
    "entityId": "1479516387",
    "entityType": "Track",
    "nonce": "0xd713e2b464cbada3cf1fa6184d0626d57fcb8ce7320d990197b5a8fa2b7b86e2",
    "signature": "0x37449ee55099d960f1f7038d122dfe4ec7417fe1f91aa6e0230f86aeb5746d4b36249c4870a7c3e055794293faea91b80dae1ee4c01f0e32eafc69cb0b2fc6b61c",
    "signer": "0x261c17dd7171Ea18B7ffF1AbB7D0495fEa0dB0ad",
    "userId": "185086709"
  }
}