{
  "manageEntity": {
    "action": "Save",
    "entityId": "553360",
    "entityType": "Track",
    "nonce": "0xad00ee3b662c03770b1de1b2febaa56233fb64db54898dad06a83165ab6ae924",
    "signature": "0x4db38d9133bcfea1ff102f4c4551fa21cd1b84ae7ff36d24a73a63dc084bd49d7c4339c86f481ada49a6104af17ede34ec788648c84e407d74e14e305c782f4c1b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}