thumb|upright=1.3|Avaste Fen, Estonia. Sedges dominate the landscape. Woody shrubs and trees are sparse. thumb|upright=1.3|Wicken Fen, England. Grasses in the foreground are typical of a fen. A fen i
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 0x3b23b293ccbb05af0745d49cde058541a7b472e8605239f6042123f9d9c11353. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b4cfc89-cf5b-4dc7-a592-93a7c4d7e071.json and https://artists.proofprofile.net/proofs/artist/0b4cfc89-cf5b-4dc7-a592-93a7c4d7e071.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 0x812611e70054089c873e9da04ca229a5a52bfd102f9b74c8476be6beb8ce5d03. 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/DES562210061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea76d124bcce9c2cddbaf94a3bc767e807c5d165628c0696bf68449bbdf337e0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:22:28Z), 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/DES562210062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f263ba61f09762778155b1f342fdefda3b0542fa58c041ae837ecccce07e9f. 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/DES561927701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18362066e268e2bd151a5d920d285164bc95c937448529dbb8565cc925b7a24f. 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/DES561927702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36fdbd7813357aed0166dfd54fdb57bf71577d4b356eb7d69df610c7c447082. 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/DES561927703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19728cfa7514c76f9529bf375688315289913bc723b0013abbce75c77da2b554. 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/DES561927704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0ada97e0a86b2db1d7daa7bf25b255caf603928a5e5c9ed2461c7b53524afe. 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/DES561927705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6999eab990a3e166768f9e0a76223fcb73462bec229df8d28c0bf7b38ef4362e. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:01:47Z), 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/DES561927706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a09f34f99a57e5f62dbb82b6a7de0e7a26f3dec5bd4ee6098c4f9930237f397. 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/ITJ351301161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f21cd2a1c1aae421704c924afa2261c49114fd9ee2b43b0347535b063c7242. 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/ITJ350900483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43caa73ea63584118a1758040cc6cd37eb299261d894ebcc23d9b754c84b04a7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:54:25Z), 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/ITJ350900485.