{
  "manageEntity": {
    "action": "Save",
    "entityId": "718212677",
    "entityType": "Track",
    "nonce": "0x8f27cce94e79090278420726cfac45c3de982263951eac02547822e24bc66a6c",
    "signature": "0x3faac7237573b1338f702bfdb258388489c59721b43781060006e814828f26e975cb907ca9b57d687746f29b1a073420f488abdeca38e601fba906b8d856b48c1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}