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 0x33efa9b02c7f9247358aae843b2d49a3c0b46efd8ff3480ae7d8d76dd8dace23. 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/3eb17325-abe3-4070-bbc3-f17e5e552f5f.json and https://artists.proofprofile.net/proofs/artist/3eb17325-abe3-4070-bbc3-f17e5e552f5f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x6fced76874c259dde0f8bd915f6ea01767955f9ca0497870115322cf174b5390. 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/USL4Q0743526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e5c29e044f9cdf9f6e47234b21cd4e455e02019672a0a11c0f63c0bfc9ce15. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USL4Q0743532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4614431a4f401d25c96b84c8553bbb3ca49584ab89d62001b3d4454329de3ea0. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USL4Q0743533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d707342b319237bc0bc5ca3507346bd1cde91f5602456d2a4275b77cb783707. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USHM21124844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec0756a5b98541910d5138ca61e61cab816783411f3949d539f0ca41e0c1d60. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USHM21124845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13bc61dc0766e54b4676c2af0db98bf51ba4e948432d82228f73873329ea1b1. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/USHM21124846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135b92db9f8edab7f0097ce400b410b180ade5cc36b369ac8c7920a154c250c4. 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/USHM21124848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ae6902a9794d1ade8a9f53fc362e3a6e0742776892544ac059d71e5ddb0248. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USHM21124849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefaf74468e719080a68df0e823d946b16a390a1e1a84176a09f0b6078c6c86d. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USHM21124851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627de111c178cd28bed43831d59cc60d0016a4635dffd68b21d9b2b5d558578f. 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/USHM21124852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450717e9cd5022cf0a7adab25313813756c7744069c6076b7e9be13d4dc36561. 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/USHM91284600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e21a95119772837a65000e986904404dce049384e5961cb3312b3c72a494ed. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USCGH1655468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d7ff26d0533b33b382109cb7ccf852898901216d9c19ae70fe25c387ee3bcc. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USCGH1655460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d31f024c5aa47f4dda7f7ebb15b054542ad940fed25b9c64514e29f49f6f80. 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/USCGH1655440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928966072a00d66d4b55874742cf230d1cf110c9843933bd6ddf7513ec603169. 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/USCGH1655442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ef560ffde7f6ad67d752a30831dbee2f4eac0301ccb0ece9b6ab5cc60239e1. 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/USCGH1655443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ab3c0da1ec856d4fcceab6d4d247864d1518cacbcde09edaef8efab0163df7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USCGH1655446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ffae3d34eabb7902010c52c4f2727b79d9d487fb7a703a00055bb5c964c565. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/GBSMU4920152.