Tisha or Tishah is the Hebrew word for the number nine, as in Tisha B'Av (= 9th of the month Av), an annual fasting day in Judaism. Tisha is a given name and surname. It is also a diminutive of the R
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307e940732f469822133af2ebe663a19b84ea8139836d5f0980de5f77473ee6c. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b73ac064-0344-4844-87b7-7e659f4f2da9.json and https://artists.proofprofile.net/proofs/artist/b73ac064-0344-4844-87b7-7e659f4f2da9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).