{
  "manageEntity": {
    "action": "Save",
    "entityId": "526479287",
    "entityType": "Track",
    "nonce": "0x9ef1f5e97839a41803341d1dcbb2879d77bfc3367febc3770a047df748f8b3a8",
    "signature": "0xd1cf9158ffb0dbe005eee24cbcbfaf637d96eeee26f52602b86e7cd2345b61d66d6e5e1e45530a1a2513857308f4bb7c9cf1212659f86af6c20e888fdb7ff0761b",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}