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 0x9deb92c7b2d6cb3127ab68e248a75769561795790d5fd37c04b8e5ebf6c75480. 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/c3cc9d42-29fd-4e22-9399-d81ca3eea76b.json and https://artists.proofprofile.net/proofs/artist/c3cc9d42-29fd-4e22-9399-d81ca3eea76b.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 0xa7a91758c0ce9389db617cda9d324df49c184d0b51e5be1866f9c50c570970ea. 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/USDXS2012589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6492380b614eb357d2028c2e824901815b88545a80d2018c7512d7b26f5ae482. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USDXS2013528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1652fa0f39ab09c6d89f045f6e642971c8544c05707a9fa39198ed1b90dab47c. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:19:34Z), 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/QZQMB2100402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654809280c7c41c44f4d5ff6b128f37254659abed7d4dc1abbab49e9c09e3a7d. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZW9L2285305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d0a8e510f04b6d2600fde2ed1a9d11bea7acd117269a596f27794c9126c85a. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZW9N2267576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29c03998e864114d80574b8a3cce9d8a729c992a72f4260ac4f02abccea4f5f. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZW9N2267578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510f25b051f98f2de40dffc86b63cde273cec4b486d7969fe81745abff1e7226. 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/QZW9N2267581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd86a0f606fda7ef0eee4535575aaeb8a8f3f3578e0be44a55ed2c7773bb065. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZNJW2341026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ec4b478389f213171a4a161035dc8b782789e3b0d4903b886bc86f8b001015. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T01:07:31Z), 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/QZTPX2338699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4082b50e5de4e50bf724c07c5ce4286e2c9ae6e9fe4b300639fd9c7855f28e. 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/QZTPX2338700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1798ea8286cc45f2ab289a108ace14fc448dc8fb54a42069b1ce35907bf67688. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:30:33Z), 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/QZTPX2397586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b65ef67b438094d7133632902244f419fcc2464af833ee48e1f1aad3634609. 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/QZGLM2421863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10f47145f58641fb67045fd3f04f0eafff4eda080e2715f80d94bba6d28f713. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:05:04Z), 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/QZDQH2427541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b55c4bc4fd2f1576203c9f53866c090cd2d599dd59a2ab11274229b465815d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:59:47Z), 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/QZDQH2506065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2627582d259c55029f2474c589b35c28fee1127dd2eafd7ce855ec9f3727316d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:33:08Z), 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/QZDQH2506066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a85d1cf2e6349d4d4ef808881348dda8753bf3e6c92ed90676d2dd608dd6b8. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZDQH2506067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1960bf3bb369c512f5f89fe8b367aefefbb216b71dc9d08826e69027bc344e. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/TCAKB2523527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e84c05313bc391af6997ca6f11ab08c78d60418428f759dce91e5e9715ec122. 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/QT65Y2569104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0da42e3dfbf25f4e7f99f2e5d038690fd77e6d3d36f02cbba7e2f26e983c836. 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/QZNJY2360888.