{
  "manageEntity": {
    "action": "Save",
    "entityId": "669258603",
    "entityType": "Track",
    "nonce": "0x312714a4ac7f4b811e1018db16888a2977f683495ee0b188d9f6a00efd35e471",
    "signature": "0x4d5b2a271b97b0e2c79496afe9c12c96a4c8b5ffcb3ace4b2fb7f2cd8db62e5303dacdf21c56ba9a5873a0c278f290faa299aa5c387a9d35e6e311360c30849d1b",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}