{
  "manageEntity": {
    "action": "Save",
    "entityId": "1098366",
    "entityType": "Track",
    "nonce": "0x515db961f8a34dc15e3dfaa456fd5ef2b253014ee41ed4e8d03d4ae2c659360d",
    "signature": "0x645d8ee5138b2fc1d45f1672968a1c817ace9257fff7a396e5fb8f98a5ffbbf170b6dea2c90bfe7074d3cdf20ec8570a2b4385aeebfb82a7ec42c8906793a2661c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}