{
  "manageEntity": {
    "action": "Save",
    "entityId": "556126943",
    "entityType": "Track",
    "nonce": "0x16e7d244ab10e8121d40f56213d21b88aa56ca5695e29905e82de7485f71be00",
    "signature": "0xc21e1486e3b49444c019b13ca8b9fd2bec3b40472513af8596c2e30fd8e798104bf2d131982d3264a91d6421cb96afbd7628c2553ebc650eca677e749594a3431b",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}