{
  "manageEntity": {
    "action": "Save",
    "entityId": "57777",
    "entityType": "Track",
    "nonce": "0xdf42493aecdd65da8044b531ab7e62618ba1924eb43b3a5d0c8776c15ccd006a",
    "signature": "0x06dae8167bb3e793197edd02c0e243684ff652b3ff95944d0fd916b0bfa3ec7660c86e411469678c10266e9ca7e7e2a3847cd2738fcbec2d06bb47afbfe7ab151b",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}