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 0x677a523d94223d3fa5006e0d14ce03f72063a43e5dee96ea30e7e16255ad00ed. 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/9cdb5225-ccc1-4be8-8f86-5ed1141730ce.json and https://artists.proofprofile.net/proofs/artist/9cdb5225-ccc1-4be8-8f86-5ed1141730ce.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 0x0d5aa7cc732497ef18415779ef65c13c43c0a22dd7a3a04db693bedb7c1d67af. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6M2005558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ce72de5a2d86c29264370f674f3027523c6b6c32946434236c3b7a9e48d060. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/NL5MF2103139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bed01e4bc66fdfc12a747f90433af2c3914304f68b29f8cbe2a470da881c23c. 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/QZPLR2432095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970e2cd649b7c729bed1acc53c0fe3e54578d99e14867ac3ae6414260f598a96. 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/QZK6K2435520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f94a2e51cad77361319b194fd0a05feda43f95c632ac3b981e077ecc11d2c0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHNC2403221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7a99980831b4a120ea65a0adcf6b626c6d186239ae0542114c873f4a16164a. 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/QMBZ92339709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc099f4dd22d09cf3993853619776c4446f47aa0c02d84c800e9b4357cfb974. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN92318584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa418e6ea7643c0318c939f7c82156d6a595a601b1236968031e017b4d8c60244. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NL5MF2101541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6df4c577f2fd04412f010e8866c2e437a4b49be9e767efd56cc40364348d4a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NL5MF2101345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59cd51a4ed43de8faae94ae9b5a87982d38b4297561b370cb75cc8dcbbbc26d. 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/QZTBA2258776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccebb6ca36c1cc41df522e2c1a9ca3287d2d4c39291138c026f307a54bd422f. 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/QZNWX2283944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3810ced1f3a8e980b6ed9c53891f8393693aab77d97f81089d13912db1c39aa. 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/QZHNA2114925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9e5f2862e00883f1d21350061ab3409a245c774467f6ed78961733be959a05. 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/GBKQU2133954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55990269fb79f2bbc9d7acd8eeea4f982dd5cd9dbef5b8a95be28e11520f89d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLAM42000097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d89b30dfcfe137e5638bbe9465659f01eb0807a074adeef86f058600673b92. 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/TCAEM1952503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a251b597808896bbae7b020ddeea80ca92514d1210a454bad4b6893b75ca5e7. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NLMT41901208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110a8315de61b0be0a59196241339c49d5be032df1b87a3208e4415ad300bff3. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/QZK6L2314421.