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 0xd124161ab94fbaa734dd11b51845c0f7a2e3b9119a245f107605eb31281435d6. 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/cf739b5f-1fcb-443d-9f72-abce6ddf06d5.json and https://artists.proofprofile.net/proofs/artist/cf739b5f-1fcb-443d-9f72-abce6ddf06d5.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 0xeb7ed7bd8e7cbd6eaa695bdb943740e3bfa78d3afec506a111444b38cdd0ca37. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/USDY42196273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a630b2474574e83d257c39e7046373c72aab0aa5477b7afeb198935767f019. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USDY42196279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adba553abf1b4e47b83295a607f7773f086ae1f9a16f4e1525f144670da85b7. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/USHM82348850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f97d916bb61ca29d9ae39dd8442f7bcfc165df82c544e84bc639ee6d7f4d82. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USHM82348851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d88509cf7bc250889822e3af0f17df5eab08914b251b76eb7a440cec899791. 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/USHM82348852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e13f590844205d8feb69789d3ab96ef4c1bf5d7b4181974e311d5aa09c7755. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USHM82348853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd7774d67d7bfc1199e61b84e063ade1b4f41d1fdfa0a912e969adab6ce8f5a. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USHM82348854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097e9ac809445e90bd3f4cec5a08658c36726ed74e3f242a5b959d4784af6343. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USHM82348855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b3c736d93dcad0a01af52c90db61d69a66c93da9512eb516457f2afaa9c605. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/USHM82348856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1a51fdac13afb97e77570469b43036c325b302c6caf324f354d9a108d25711. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USHM82348857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298eb3a2d7a9358bf29c3be9bce411a8d5ac80c2cead5c075a0bc377079a1478. 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/USHM82348858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f70c3eef82a1764f94c2690a202b82fcc525f0c013cb22259356c2600c7f370. 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/USHM82348859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c32ff89b82430a0df07888a76c56fa107ea5ac03a9c81e37ed33706f10b8e2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7P2424722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ab57b88e92938264709d1c46bef0acd426c72c2476f72bed42863934d7d750. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7P2426880.