{
  "manageEntity": {
    "action": "Save",
    "entityId": "1745607957",
    "entityType": "Track",
    "nonce": "0xfe9f27ad2987577b9b33bd7359311edc34264929255206c74537e033145fdf3d",
    "signature": "0x99506567286719ab8563793489c409677f90c0487634a1349d4d95a2d589bb993b6a3f759c61a9f6a840a335abac31ce82b7aafb699b70047f07286ae77891651c",
    "signer": "0x8c3aa6cf594458763078BFd2ef8282051A8DBC16",
    "userId": "576672259"
  }
}