{
  "manageEntity": {
    "action": "Save",
    "entityId": "2141247390",
    "entityType": "Track",
    "nonce": "0x4fccc72103539dfa8073255200ce1faefbff24c3b8bcfda701e79d742f0b6790",
    "signature": "0x1aad6c737f5ef2b2efd7461be14d21a08e5213fca53a4ecae10528c2ec7e5d090099c9cebbdaf2cd2cfee3d51117fc011e03cfe3e25e741d834de2958f7952fc1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}