{
  "manageEntity": {
    "action": "Save",
    "entityId": "300206588",
    "entityType": "Track",
    "nonce": "0x665310b0bdb5542f49db41c1b1b4798de2066e5801c4417b1c156c51be2c3b69",
    "signature": "0x7ecbc4c2b3c3b9691fd5c6e566e1dc28a984219aeac05921b6dd68b360a9fb73234e13ba1a25b1791dd564a0bce804df6cda53f6d4f1c050393bd9e3b4b8ec711c",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}