{
  "manageEntity": {
    "action": "Save",
    "entityId": "154629792",
    "entityType": "Track",
    "nonce": "0x1f1d519f3290c432902567fe3f9c46202f14ef5869c4cfb3cc04196ccd476237",
    "signature": "0x7b3f9b81cfd672f7bc686888b83b8b06412f45035b0cbc24cebadfa9c169a4a723ec5f7048fd09032541113018bb3700d9ddae6a8d864c9a752a4659f7cc4c3b1b",
    "signer": "0xfeBBAF2B7d9F5bE3DAA34bEe70259f61ac4aB836",
    "userId": "139146722"
  }
}