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 0xcde470c78c3534f1dbf2ffc093069738d25d7c60f24c3d1c996d3f9b53f46029. 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/4d78af20-a4d5-4557-a605-f1e86d2a4b58.json and https://artists.proofprofile.net/proofs/artist/4d78af20-a4d5-4557-a605-f1e86d2a4b58.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 0x3289957ab760587baacd8889a941790bd44b9b5b26f651dfceb00fa994c3acca. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/UKPNT1800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa939b10c896435d84d54e80317886a855dab85265187321a0fca535e6974ca48. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/UKPNT1800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef08c77a9ad0652ad76b5de801b2f69fc1e955d581635776b1a3b17764b85c93. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/UKPNT1800042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4194bf4f709922abe022b49e17cd07f7305452a2160e945b6b93a8c8f2526d39. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/UKPNT1800058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3c818a7a0953dbe452db8932197bf5f2d33536a278f7ac5fa64c0bfe4f3217. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/UKPNT1800117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81630036d7d295c25ad15b35859fb645ec8d9afa579474b9931308cfcd724690. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKPNT1800184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c88df79a91f88ee14852557875a4f3e7a451c641586d13ac2070a11a49e166. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/UKPNT1800119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe67d32aa5288f10b75e629371ebd30dc30746394b33134b20ebe5f3f6409674. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UKPNT1800182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3c818a7a0953dbe452db8932197bf5f2d33536a278f7ac5fa64c0bfe4f3217. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/UKPNT1800117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea338bbe4ef9fa280e1cd4832bd635adc13c2cba1770a2461a4ffe2b5b74061. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/UKPNT1800151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d9796fd62cd566d1f2a36a5dbaf1bec9a93c5aecaedf7d4880d1ae7ce20e14. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/UKPNT1800183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe67d32aa5288f10b75e629371ebd30dc30746394b33134b20ebe5f3f6409674. 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/UKPNT1800182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abeee9c61ab9dedd3ebb3553b9f75847cb51c800b8c3e9170e8863acffdefeb. 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/GBUM72202061.