{
  "manageEntity": {
    "action": "Save",
    "entityId": "1728019663",
    "entityType": "Track",
    "nonce": "0x1cf33b72edc12db4519e36b256ccd80f5c34d0bc99c1565297b5f774314e7443",
    "signature": "0x9b006d5efff67d7e559c94e26860a40348c68aeb166073f58673aab4b240274d380ad85db56bfd63d2d2f60d10d2926e538744180d52a87632fe012aa6ced35c1b",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}