{
  "manageEntity": {
    "action": "Save",
    "entityId": "718729764",
    "entityType": "Track",
    "nonce": "0x74418326d610cfdbf9764797cee5f642c5051d3522f7f2c9637013495b9635fe",
    "signature": "0x7050a494c13b89eb807968500df3e51b92b6e7ad6904c3935e5fdeb5840249b6068e7df73271fe200ee37364d60b31278f0743fdf5a7bb13d6d07097658ef6d11b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}