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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf945c8f0d1dd4fa459727c5e2f60f6a1dd5fb7ecc6b6269f6c3ce71495f8933c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/894ecdc6-ada6-411b-98d9-f887ec5db1d2.json and https://artists.proofprofile.net/proofs/artist/894ecdc6-ada6-411b-98d9-f887ec5db1d2.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d72a8371be686109a77c855a061774f121ed88f24530c86befaff601db95b85. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:01:46Z), 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/USPWN0910157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df43e2810ad9ab2c70f77f4d1cb7764898d2d3eabab6667eaeb8808366314b6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/MXF068800151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de4b7cc79683e43ac57007574efdd64f0ebb17b81aadec759ef0b5455666cdb. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T08:50:31Z), 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/MXUM70903227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f72e29a916e7dbdfcf074eb15f0075570e0c7e1e208f3fb438dc4302912dd6. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/MXUM70903244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51ed6991cfe785c2946a06a86f361af31b0412f9d92b6e39056c02e37e969c0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MXUM70903222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9cbe38622b6a96e60d6501f8a7f8fa1c4e5a4328ff3e83491e91629b770c47. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:35:10Z), 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/MXUM70903230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175fcc4a5725fd54c6957cf0f885c9022cb67963f5b650229063579f6f2468e9. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/MXF068800147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6eba317b51566a9811e1ef939e644d0eff711d87146dc419eac0b1074fe986b. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/MXUM70904158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8897d0ed0f61e83a25a55255c7ef37e22c32ce1c3454e9442b0f5bdb3a45f0. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:56:30Z), 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/MXUM70904188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f51ae6bf185e8968707b5efa4e95ba9f9a43d97d50c98f87e1677ccc68eb14. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/MXF069100399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1b4755825efabb3736c14caa47c97dbb50ecea4e259db307c99ceaed74dc67. 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/MXUM70904176.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758bcbd62abe7b074cd28f8030fecb60de2924ba550e3d97658e458ad2485aaa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/MXUM71100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a233370c5c02464fd077a315980f049fde5ec72f48b9f54165ef3961590d857. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXF068500139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820b3d1a53105c3705f356cb44c9aeffbca332fd2760da404fa2e53e4c2fddd6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/MX2972320416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5bca5b2cc8879d0caa1c043a92d4679f389b30ef49ff8007cc5413f2b340522. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/MXF060400574.
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