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 0x2f4de6ac4bc90e140c01a2a542a20d3b7bef40672a59f44406ac6b6f08441d18. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e32e6e76-b534-4baa-b92f-5d0e891da0b5.json and https://artists.proofprofile.net/proofs/artist/e32e6e76-b534-4baa-b92f-5d0e891da0b5.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 0x36bd9c198b39a87a40122ccfaa113e1a08922e417299975b198a8321073f1f23. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZMHP2088099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660b8639aeffb81c70f69275a27f7cd66796f2dbe76c3e6eb5d4f2503b4827e8. 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/QZMHN2090499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f955116c45a2a13ecd87af4aa44654cbab45f20777f7aebffea638af8e288cf. Chain 2 (Bitcoin): anchored in block 958677 (2026-07-19T05:47:23Z), 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/QZKDK2207508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cf2c48a4623885f053ad93b19004c3f0367872e7f011a9a96b9cfa8a1e34dd. 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/QZS672275067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c8e5d6f6003dad33d290409640d3c52fd3549a9fbe73db8882de8721a6c339. 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/QZMHP2561365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b641f4b7fb1ba93411fe23befc1c3f2c587f2aee0fae2882104e8139c3cf29. 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/QZMHM2512813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5157098a2fbed6072a3650da23c39039938d646f536be38a45fb71f7f674fe2. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QM42K2565108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120f8942c033a89f4902a351581c4b63e795fa2ddbd7d511a0bd0e43eb3287ff. 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/QZMHM2598002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54f2ac3c93b44b5c136060fbcee04ad69567c075ae0af7463e2512662926c2d. 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/QM42K2556926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfba0ecb6f5e794cb616688ad73021aaa85771d83cb1abff76fea13be778c41. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZMHK2550965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb2215ee01b93a78910a57f641d3a8a4bdcb650015344fa076be86410768798. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QM42K2586671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9f6122b48f33cef7d753148d75496bb9f6fdfd6faa5b99a474a0ceda3922e8. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZMHP2526632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23787eada9575d6daf47ff52ef7b6df37679c47b918d56ac5d6f97e5edf53bcb. 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/QM42K2594751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1072de022e4103ee991079ba5fbff62d26d1aa2296f4d5febd067ff2e7ff8f6d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTB72561485.