Grant Macdonald is a silversmith and goldsmith company based in London. thumb|The Grant Macdonald workshop, Bear Lane 1982 History Founded in 1969 by Grant Macdonald, Grant Macdonald began as a silv
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 0x48ee35ec776f7a44bbe5cbe53b88d611d2ca86476b393fd9e217001d72cfc4a9. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17bde8ba-ead8-4c57-a920-775fc4a608a7.json and https://artists.proofprofile.net/proofs/artist/17bde8ba-ead8-4c57-a920-775fc4a608a7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6e4d5eff6ba9edb2fd9780012d256514d719d456aae1f84164dc8136ba6644. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81250936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57255a4d2e6592e9b43a316919f8da63dddac741a24c4ad92a526cae51abb3f3. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81289194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bd6161e6e45c42f2d8a410cfa7b6e1b737c5892526953dcfde35bf586849fd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM91211877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff09122cfbe6503bd0f561ad5185d9becb1fc80e5867890170d7a5ec1a4e17fa. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T03:26:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41831589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0de247e2ab875b1550a73a9365617d5933b749e478a209d954da8ff563053f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM21813712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ae78d7f86506fb9dbe3692b9bb224b12d757a1dbc62a9c0802cf8c375e1d36. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM91814489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103a957e0d4d208a0095f60038b4d45243dfcb3cd09ccd4bba2601b408b49e45. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T02:02:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1947689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215f0b32b2a1ad1860ebb34749c692b8306ce493c10e4fc81fd3ccded07ebd1a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ2522262.
Black Soldier Boys Buttfuckin White Soldier Boys