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 0xa24116d92478bb417b7ea0be6c498f80eff3de797cd9778da012d917c3bafff4. 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/b3f605a2-e212-48de-9da9-a0f5689d2b4e.json and https://artists.proofprofile.net/proofs/artist/b3f605a2-e212-48de-9da9-a0f5689d2b4e.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 0x0f2f54c816362769b8c6cffc7be501a314143cd740462117d9d809a167700b37. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:48:55Z), 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/IL7112103117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68de9b247c7f2f1887898c973ef948e0be574542cea7bf560193875defdf3ff4. 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/IL7112103721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8124d4bf073d84329f1b34713f2193166ff61573d3d7051048876afdb4742eb9. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/IL7112104401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cccea028d9caa57f2e32cd5d3a838c41f343e61d33d564902fa04aa1fc34c5. 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/IL6652409252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea12b556935e689886062111f4fc9a3f954767c69b4a6700ab3927712e32dd54. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/IL7192500290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c854a2669bfeae5eebe8a9bdc0e05abe755335b97b793637c94a4305b88796c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7192500291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238e6eba763db71282a2a1e8c19f6acbca6f7471848601a8210ce730e0f113ee. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/IL7192500292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdcc508906f9136fa0102da3e10f017df3ea40ad7a1c61bc17a9615d50efd14. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/IL7192500293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8676e7c2334ca83143d385db8d785b8b10ba106eb4a81f01809b201978db63. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7192500294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5271885e012ea1196d4893adc0cb59102ea5778e74db95d659b5ac1073bb18eb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7192500295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697c829b54c05f4138c9541d8a1b40551c43fc73812ec17cd4908a9eeca65916. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7192500296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b6d1443c94452528daaf52263d89b524c4db3aa08904f0e15b01c95f879817. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7192500297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c90546ba398234563191f4310a9989c121de4d7b5c61d4cdd28f26504a12d1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/IL7192500298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c259b549fc9436aa70194b5e4c0fa02011bab8fbaa416964e049e2e38e7780b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7192500299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0c491fb9cfc4ed75b165860878d545da3484106a173af2cf065297d18d651b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7192500300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc64aed530eb90206f84e91e59f921d76f01f1db5f4a608209d51ba9ef8d4b86. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7192500301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0d7a4ca00a406e5af692b372e81c785debd1b24371512b2e08721a417c34f0. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:18:22Z), 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/IL7192501125.