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 0x0df25743b739ad94fc3ad9195e34c08b0560fef49a3043209b51b4c728884e99. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/add0db4b-842b-4ed2-8db5-b208917e390f.json and https://artists.proofprofile.net/proofs/artist/add0db4b-842b-4ed2-8db5-b208917e390f.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 0x9ea46e87380acd59a12dc6e0993920ec9a93544214a93dca56633131fb00bb55. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZHN62492900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811877fa3c569097af519ee777a80ea6a794dabc0a5a1ff0bd58a7ab0e4da764. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZHN62487304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d702b7ac60176d971a8c48178b046a2df6677e69b0107f346da2cf8f9a5d148. 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/QZTAU2407682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a09244fdccf31a8b8a50ca9e9d07538ab9a45ad653d47a120fb86b046a60be. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZTAU2407683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d5af81c9b14154beb1ca896d17f6dff4d18796bd72506088632aadf01f3bfe. 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/QZTAU2407684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8d5cff087bb156fc599be19573521b91bb390b788864d12fdcadaa9342301d. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZTAU2407685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329842cd5cb840821f959983cf1a29e4035fed3843639a080e793cf79965ad91. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZTAU2407687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ddcaad204944a345bc61814d7b243ee26d19b7c35ca51bf2640ef79ca4acbb8. 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/QZTAU2407688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf766fa8093582447ddc48a68d9a983a52b9c3e9c33450ab43d8b87107085a182. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZTAU2407690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e9793ce33780f58864d889ae4e892f60fca4ac68269b5eb59878f6df6b04c8. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZTAY2429019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba5f66580b8b3b0fb40a75496665a3ccfca14a1d5944b46e2f23bfe59f215ea. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZTAY2429020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68bd078fb06e7db8e6f75c2898efe01b665eaebe8249868f5aac15bfcec5a46. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTAY2429021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0bb8ec5f8d50a858fb935e3c37acd3e5ee54c165152fb4d8a94f9d783780b7b. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZTAY2429022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab782a92e5adda23e3c619f6799a302a5b2b83ed0859c69d0b100ebe04b66be. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTAY2429023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217cc7a38921abcedaf5eac9ad34407055db5276961ef2b24397d6332ae42e93. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZK6H2560557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9f07e59f89fa4043b2891972dc581948cdc67dfe073fef2b1af7fc73d28848. 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/QZTBF2526339.