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 0xc8dac2a0395db55adcb351813d67f03733065415c969f60467cd02af05cc2527. 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/587f834c-c8a8-493a-a8cf-a665c0517cc7.json and https://artists.proofprofile.net/proofs/artist/587f834c-c8a8-493a-a8cf-a665c0517cc7.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 0x3f69c2615536e865c5908163d29b0d9a9592b1e7cda96a006355294bd527caad. 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/FR3Z81001629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754b4377d1df445524d627d6c06e40a44553708c7a48d70dc1d4e12408b1acb8. 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/FR3Z81002558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5edcab8fb972673ce918bc86fb9faa529a1f702f84c906a22036aa652ab925e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR3Z81003546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5572fc817525e88b054fd72dbd550635c51526dd5b97c812e6ead80249677830. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR3Z81002568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60432b37daa78079f5da5e551a6ccea74b938cb7fa722f3ab2f6533cf6348e9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR3Z81002555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6f987be997fa3a020b22d102c2e36832998acbc92aa75888c9d24c3d414d9b. 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/FR3Z81002517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0abaa6194af1417d2fdb48e4368aa0006958c0b8f74006974bd60463ced99e97. 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/FR3Z81003543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d1750ee6911355bb9a7cea1578d3912517efcc4c0a16d4783e82f30d7d0df5. 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/FR3Z81003549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916f58b2ee005a093aa75a133e16aecd2ddf99298e7ddbdb20d92b443391b75b. 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/FR3Z81002563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc52fd6dbd5c2fccc26b2000b5a927ebc426cfabb5fc1cc487784709015cf3d. 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/FR3Z81002560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf42d980dc6ff3a34f9e91703709e5490c5ba190938eed35b98ff26164e275d. 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/FR3Z81001760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177d0c6425e29bc6e9aa1fc793d9d3bddd67846529957156ee2bb76672d5f69a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR3Z81002571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dca5bd223a145b67e8881293e7219d38f3eec028b56e9d6ff82a6b05501b821. 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/FR3Z81001751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0cb15209ca91b9b38f3b0c140cb675c5afcafc6f5eb498dd84cb01b0fa46111. 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/FR3Z81002318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b5ce26ccf1f60685f0cbf4ca81beaa29a7db35de19f19c5b67daccdc1b08dd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR3Z80901770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f0ec4fc28aefe94ec3383b67bea6499d7c93cc61be825e08302362a83f1e0b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:51:29Z), 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/FR3Z81002138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c47c5482b3ee1020f48e30546a66005e447dd1e90ddd6d0265c8db52d8378e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:16:01Z), 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/FR3Z81001728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9119e5d3613f102072689c085c80dda2f30d5f321781810e82c00dc2f5d0c0. 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/FR3Z81001731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52574f8c8a5c8e0a514581a74874384fd45cef283fb3d74a0b140873c71630c4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR3Z81001734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf7f770aab2ec2e5fd482644ed9226f06283f646ee15430865b0900879cd992. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR3Z81002503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f7394f09ce5464540400b09ee2282cdd4314842149f10b346b8f5ee82e1458. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:18:34Z), 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/FR3Z81002494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56837b0f9e6b6a5a24cbb10266dae7827916222adc611715bfefa05c561a34a3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR3Z81002477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92291be5f22b7912fcf2bcd21f2bab6f09253d2c19ecd87ed0dd1c4eb5e1319f. 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/FR3Z80901686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7268f002bd51ebeed05f2fe6aeb2c52cf613a223d90664c6cd42540c5cb1bc53. 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/FR3Z81001745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872e58aadaa5a12aa019313613919a564c0c37717b4796241cfff85f63ec7af7. 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/FR3Z81001743.