{
  "manageEntity": {
    "action": "Save",
    "entityId": "3997500",
    "entityType": "Track",
    "nonce": "0x57df194b6603f98f354aad63934d850bf0ebc8d935b451a6f0a0b963ae4ad523",
    "signature": "0x7c7abb1cfe77bb3840ef38331eb704c24057bc746ed7eaef94d132d6e9f9f4775e3f7341729f7cb7151b623aa60284dbd80bc3847a48c9ae9b799df8082ed6f11b",
    "signer": "0x3EC8c7F4Fec5D21Be724bB4D43502e44e018690F",
    "userId": "53828"
  }
}