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 0x414ba38a850959120efe700e31380ca1b81726ddc36576da0603585a3d0420e3. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88339af6-d652-4e68-b644-bfc1f28edb09.json and https://artists.proofprofile.net/proofs/artist/88339af6-d652-4e68-b644-bfc1f28edb09.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 0x7e7abb6c4969757863b5296a129a60a500fdda333b98450d18c74d26e42e978a. 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/USLZJ2433656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456c111d0dd72acc9492b5b4dac941262c47ce7ac76218813f8b67efbeedcaea. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USLZJ2433657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5591511231e41580e65a92be7abd60a4e9b3e09a8f303fef6df5b27ba8ff735b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USLZJ2433660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb53381deb8d6114246007c607a6299afce6fb2ad704ee2440410f7839319ad0. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USLZJ2433661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99881298019f74c889962b8245106501e1974652e7c828b62b433cde21c4b3e8. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USLZJ2433666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3545f9182be037213b0c1c9c7fc9d11b2c5612704b352ae520f0fa4cd02db99. 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/USLZJ2433622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c45cccd2e33d82edc73273c17c8839d992ef0d25e0a09aae073443044862a3e. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZTRX2443586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c12e688625ef156363e2935372faac7858c156cda61e1d0f642991eb73baa0. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZTRX2443603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973a4c32994b26318a40e8c138c08c14f62f348d6e00a74089689f3cb9fc00d2. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZWV32445500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de2c40356e3e485962d428f55afed54759bc0d0380c1d4fd6725c7faa3fde0f. 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/QZWV32445502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547748c2c21bd2c157bea97e635e3b9c2f22d692960368b1ba930b3d81e7410a. 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/QZWV32445506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793a852a53c694d1b5103ce7a703c64c7be941cb74678c25c3362a0552cdb426. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZWV32463304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd716234925b7e85e5893171d1266808c31f52ee0569d8fd4ad9a8a0dc2ef2a. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZWV32463317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c553fac7faef5a7c9ebc448dd362fddc4b1fb596ea9c7780b97e62ed11fb299. 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/QZWV32463322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62064a87a4bd9d976e9b60f7b203c3fec9d7a86637429b7c810d702cdc20da2c. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZWV32463323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1566cb129f797168c26f93940826a9d1e4632f2dccfcdd71c1af0303d486a662. 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/QZWV32463324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd168ffc8f61675bf444aab5ee737a8e718037b91df0157fd1f318d4c0b9578c. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZWV32463325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045823f41f300ff4d63f1527289bb4045fa522de8f5b38ed65c04de2fa8f7e18. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZWV32463326.