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 0x9698d086dc5fa80eb50b782d68a540675dfd6d80fb00879094f48ed7854ea089. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d712fcf-1777-46a8-828b-f0813f8b3d78.json and https://artists.proofprofile.net/proofs/artist/1d712fcf-1777-46a8-828b-f0813f8b3d78.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 0x2e464019467edd00d53cd978534c92a7cb3f993ddf97a48e8b5df7cfc8d99b70. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/ESA012576967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4869d9c616e34401934b91eaea368b5908591600c615c08b04968130be33ecd9. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/ESA012576968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfc0da275d7a6b86c3256817d92e492e6acfaf0f3f282a83c4de1caa84d31cd. 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/ESA012576969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ed1073ce9769b4e3a21c865318b9730ab72f13f3d8da0d828b494a05653cda. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/ESA012576970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9179edb13b365788c40d3f55a395fc615dad0095157257db0feea67eda59fe4. 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/ESA012576971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c5daa3797b10d3ece074fe93f9053d08cbbc47b2847cfb87eebab9e57d4a5e. 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/ESA012576972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca35041411f1b6e93b2f9e97971ce65ca0a33651606b98b132e4e0331798c7d. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/ESA012576973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0120b6473fc27baab1be461ca1e19e2ac252020398126f3bbbd8c507a2a35ed7. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/ESA012576974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0117645d317d79d94b731ed8895be152b9ac247f1825b01ebe0a4c604c262e2b. 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/ESA012576975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b2d52875cd28b5d67274d7076752b72f6179c8a13e843d66fb3f11ab78c853. 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/ESA012576976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac847b3f4da28cb98118793918a6492eb183b7112f754ef50f2742849c5e8ec9. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/ESA012576977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec031f19871fcaef6810855450cbb81fb5d40535b13e892a355ac2a16ca04bfc. 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/ESA012576978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b843562fc2f94cbf59b662526991222403a4bebd786e711c5d61de238340ca. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/ESA012576979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda663ef84164e784dd609de841c0714540c9baaa313948d76329b2279c2e9e2. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ESA012576980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072afe798a11ef1bc09eaebfd5c94e94569365cffedbe791d2047d32e343befd. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ESA012576981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f411e8e99e11c119d9c6a4332d4b261c41cb2979b5f0e70fce9a1177d1ea2cd. 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/ESA012576982.