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 0x4c854e30deb17ecab9484fdf2e19ceb5f580e89dfae97de4287f87b54c0f7327. 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/9fe08988-6f6a-4fbe-9577-e97f8922e0cc.json and https://artists.proofprofile.net/proofs/artist/9fe08988-6f6a-4fbe-9577-e97f8922e0cc.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 0xc73dea01b55529f4539796c1fd1b959c9ab1b8b4b4739aecab0885e7b289ab2c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/CAZ700906420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04aa6af9d3e72aeb4d17b9ec410075544e5b9a4a15b433754acecd002dc0a797. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/CAZ700906424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4f11296506d8215092bdb51aa2fd72150c3b958bb121c0b3f85605bbecfc9e. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CAZ700906454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d00d797b07e57de38a4e9782062fac64a212debd2f21e3eae9aaebf28d79ab. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/CAZ700906441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a4a7b7ce8ee17a77d3916731a290363c6f58975ca03a396f5cdabfb83573a1. 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/CAZ700906442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed04e53bb2d5fd91a10223ad6ec79c508960f2fe4f89fc9404f7a663739eee07. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CAF700970201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1606393bd6a975b453c7af7c2fe744404648ee02e161d0e8960f80131ab51c96. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T11:18:49Z), 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/CAF700970204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601596cf8bedb2686d92c2aab3e10deaf80134301197aaf15fc96da11416a402. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/CAF700970205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3ef580b6199051b81c24564ce88b9d9d7f3e085c8f86ee14ff135fee7510b0. 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/CAF701070301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0dbe90f493df1a45e2ba92212b07d68607632a238cd9accff420088034b8e8e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CAF701070305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961b9355a37e419773e65e709ca927e22821f9a77ab3eec34fb6be9b46be49cc. 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/CAF701070307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640c7516d034e2abf2b60a68e34d706ce7671c5fa0d66b2428af3d4953f4dc53. 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/CAF701070308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca9bca29eee466fee76e4334e150530bb70da32e579c534a87568d95bcedcb8. 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/CAF701070310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223c1318ac73b4713a5e52583f4133cc77b6114741c1bc10544fbf997a16f71c. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/CAF701070306.
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 0xca08689ce79931c29801e12f49a620a31c20bc8bdb6888c22b4deb83c3c2d531. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CAF701070309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97d839d8c34e2199b2f335c455d1f013cc4d55d4ffddd85e9c79f1ad2e149f2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CAF701070302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e20ea2f01bd589d42100872eaab0469a794f455bb67dbf633e1f462f8789f99. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CAF701070303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6c8d058f5866417c9fea20e57570e6c735c53cb5cb44a37ab639ea3e232091. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CAF701070304.
Marjo et ses hommes, Vol 1. et 2 (L'intégrale)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fdc104dbbe85ce1ddf40d9b31f4503dc34e005a817d769d19a6f7931736e58. 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/CAZ521733116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1fe487210ad2970d9f7d9a5ac401c41fb8987cc5173e32a75b35d8c1149cf3. 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/CAZ521733107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6cf688bea5e3e140117822448cb7ffef08822c82ab3090eefcfa136898505c. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/CAI601591709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de37690b8e8772c35aad8cb011382b313fe6e52dd5575d03790df7dc735e8af. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CAZ521733105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f23e72e5745d539e859d7e099e26e9725661b410217a744a7293f0d8137e9b0. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/CAZ521733106.