Charles Grant Jr. (August 31, 1874 – July 9, 1932) was an American second baseman in Negro league baseball. During his 20-year career, he played for some of the best teams in the Negro leagues. Grant
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17d42b389a1d8130802038a9408f7fb78d95dac29799eed1a160e223dfd0561. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/95f9ea19-59d9-4872-aaaa-2d30c27e4dbb.json and https://artists.proofprofile.net/proofs/artist/95f9ea19-59d9-4872-aaaa-2d30c27e4dbb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).