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 0x67654249c65cab66c05ce7d89a45ec4fb0e468ada2a47edd3bdc93e741b429cc. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b382bedd-c379-440c-b95e-f1220e6a9880.json and https://artists.proofprofile.net/proofs/artist/b382bedd-c379-440c-b95e-f1220e6a9880.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 0x7507b646026908d45e41efeb6d559b668057c5f2ba903a4aea50492210dacd71. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/TCAII2481654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c81921cbb7cfe5512f241acedce81e1a45e64205e336e0d08abf68ccbf10ff0. 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/TCAII2481644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09ff748fcb480efb524b47ff990a39ef973d77b12e176d3455e1fe8e8c4b7a0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAIH2481309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5ae7846f43a89d12367cf3e6de428f7eb4f3489a41d5fc9cdea9a7a91892cb. 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/TCAIR2461460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8c6213a818ad18f3bfba07fda2cd905f39d65dedb507820b0bcb10fa824b10. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAIT2461487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe762707937e9a16b9d193fb6681b9036464e580d273e8509221f404c699dcb16. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAJH2554560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2032785de90d2a0701cfec391aabdb46161889a492981e5d24a372c7ea1de80. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAJI2554589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ba0eafe4d65c57d6f2c8315c6a0644262d6b55c8de46f7bbcf3e03b5c30736. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/TCAJH2554607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f699a5c580c23a4c400ad298407386b150d6a7a52264e60eb26959da885877f. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/TCAJH2554617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd38c030d375a510e533757559390e127c1cea04e3a3ab2104f5d457c8dedf1. 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/TCAJH2554646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f91e11ab801e15a64806155f496e69613cd553dd8c318d4ed63acfcc355a87. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAJH2555007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3327a83c89cbb06a7a94094bdd9e46454626f592dcf18dcca8dd833d271f4918. 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/TCAJT2501610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8be8d107348357e3db30af71afd7262d94047772acef7c9df53276d6f9d304. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAJT2501618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7391160aee701a58e57abcda2c3668c32663f6d16921e7affb6b5630679ada5b. 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/TCAJT2501624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6631261d236a9bd8928210d8b8c5fe66384ad5061669d540c5009357a43a4ce9. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/TCAJT2501631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b1ce2e3399f51ccfb961c0295558718ce92e5860cca339c5710b5733c6d617. 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/TCAJT2501636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82e1f734344c1b8048f93e4e03d5ce54fda418a691bd6d56f50bbfa65a22a6c. 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/TCAJT2501643.