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 0x18912405e00a50c456919066ca952da8591c62c39e847ca065a2069f06574d52. 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/c8b6295b-2baf-4e18-9506-9d4af928420e.json and https://artists.proofprofile.net/proofs/artist/c8b6295b-2baf-4e18-9506-9d4af928420e.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 0xb5d015b001dcbb4efde443682052dbcdff817f76f0af43e2e4f96ca2590e497d. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZTBC2349786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d16b1d95a1408caeb1999745243cbd2cedba8c9341b508de3358245494587e. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZWFJ2344293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb542b144af608a620551c726208daa8403d9238b56f82bf0c9bc7fcc0c530f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ42408626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7b2e57f5e01c49406657bd240e2fbf576091e4ec4e36e9c1c092f267fef424. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWQ2408463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c19dc723d29b6721186c34c01f1487158fcf36f11f2ef95b32370dfd1ca974. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZWFM2411113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44831d07dbb55f88792d70d8f0c6c8c9d14217a231a2ad31ff073392d1827b25. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWFS2455405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3daf67703478203f95f3b0dbeb1a371f79316aab6dc72185a472c1cc03571b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFS2455410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8658afea01cb47cfaa35dc0534e9613ada0b8171ab0b451a549675e44c2aa31c. 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/QZZ7Q2450798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeef9a4eeade4e552f334cb6b0af578ab4cb7819cc79b8d28f4bc1aa9e7ed9fe. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZZ7Q2450799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c48a18d21690f187f4ad9083ca6495e6778cd0c3ce9eaf98c773541edee325. 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/QZZ7Q2450800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc612ecf286c6cdc23c074c5e844fdf1a3caeb68f5203f5c6631c011069334091. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFYY2516792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589a7f9934e58d2756e95ca4c1d9fd77335f52b8e8f5d0eaa15fa46c2621358a. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZDA82599174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3daf67703478203f95f3b0dbeb1a371f79316aab6dc72185a472c1cc03571b. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZWFS2455410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df73c77aed31775f18bb2441ce27d9ca6b4bfae017d8ff0dca0f5ca563f296d. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZHNB2553422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df7805eaf1fda709ec66b0f6e8d7b5886c5c199f04a80bca1b28ec28a1732ea. 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/QZTAU2548194.