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 0x477d5684a5be70821847e408922cb29bc8fe45be0fd50f94f76e675c10831f17. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0b7eafa-9bc0-48cb-95cc-37afc40620ef.json and https://artists.proofprofile.net/proofs/artist/d0b7eafa-9bc0-48cb-95cc-37afc40620ef.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 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 0xf352adab9efafd69f1ca7dc186a7e793540399bd63bbe7632401965ce8b5c263. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBTMZ1900952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1959e60a19412fcd223dd276595071af2feef051539a96f5cd60a81c5e6e942e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBTMZ1900969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfb68c74f6cf1616cd22907437cdee655910691c539feca4a78f34f23b0ef90. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBTMZ1900953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897fb9681d5fdb719bbc1f46ce4ec439a4b6e3d132c59791bc189e3c3a31fba5. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/GBTMZ1900970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a93946b9cad3def577666b1fe97c09c501cae6ecf4527822a1ed6c3cd2ee5a7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBTMZ1900939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21159375a7f07c5b1d6fcffecec2fbe42388d3cab3c8cfcfcff0cb24fc9b42d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBTMZ1900923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7926d0af7ee0fd81522c866317666a38103a805b486718776585981474113c2a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBTMZ1900924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8599d0c5bb109a8a19725830c4ac19eb0f0f0787570dd15f890c56683e77686b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBTMZ1900940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4665af651e5ccbb4a16844fc813e1806b314c3e49c92bd440f086987a805a06. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBTMZ1600510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9fb457f86364113105fe52819f8adad13dd576488005c597d6028af95b184e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBTMZ1900972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03500af51ce3d142c39150f7860e0b7faa4b5a394da282cffa0d767156ece9a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBTMZ1900973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cd83dec072269ca25f633a3ec502ff3657b10a8d7f6aace476eb0d7e3a3152. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBTMZ1700546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb3c9b4fbb8c3ee4a5fef20731661d5437ba7fe0fdc58ea4ae258b3d33dbbd6. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/GBTMZ1900968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd122982f5a1a74b674848ee829a94110d7f81ef6310de0c83d3567e7dd0972ec. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBTMZ2301156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9eb66e98fbd32502c7f00f3a60c9a57d579ea18d8e71fa477640edb1a98560. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/GBTMZ2301157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c3fe829f23c5c28968c7cbffcd722b5665a57caac0c0697db01ddf0700b02a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBPWR2200088.