{
  "manageEntity": {
    "action": "Save",
    "entityId": "221391",
    "entityType": "Track",
    "nonce": "0x98a5711beda5b1cc41a371af9c13da5ae6ab197fd5132204ebef234db30b7b57",
    "signature": "0x79441dd0d89d19e70540b90d65e6b0a8f2c5b43d503c54900329b48d711b18153bcc077766f477baf5d7fa34ec19c5bb2dc7611f7593b6afea7473ef583aa1001b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}