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 0x8bcaf2e33afc39dba906dec99635a5227fe85f5cfacacc39a2e29d85a02b8482. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a755e130-28e7-4f0c-acbe-ce1d17a65470.json and https://artists.proofprofile.net/proofs/artist/a755e130-28e7-4f0c-acbe-ce1d17a65470.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 0xf62570a93eaf973e4a8c0f90b3295ff6ead61ec61627da8041c1fbb2ae244597. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ32329456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf98c363f04d1b9e68fc1700d0a3084a3f0128bbe6c1f5b2800ead8c7ee21ee. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZMEQ2308502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1553b92412e4d4a305daa99df7c99a57130e34c1168b41a1f1d97c9645decbd4. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZMEQ2308503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc565b09c294910db0becc52ca0ba71079f807f515c05ae23073016f05585143. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZMEQ2308509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb815784f713940a9423bdd25ba9d346d2830d854cb56f0364c344617140d6b2d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZMEQ2308510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6da7aaa55dfd13bfddf384680ab8cb1c8763a07910b79064453b8e14cec4b7. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZDA52460349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0919ccc3e03d4cd6432c863ee649d9beb1c550001832ce3183ebc1dc4ca0f0. 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/QZDA52460353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d43efc9cf77d429f66f4a82f51f59950857c8757bccc1ff7eaeb95c390e7b4. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZPLR2427433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4373e0f33d7c328319f15cc71aefcce92d6af80392b36953b0a0aa2d4be3f75c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZPLR2427434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe387c697dbbef1204c829240118969f872534e946c766bf2e4e832a2d2f9da53. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZPLR2427435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c0d6b63bd21c71283d1e214e7f4d7b65898e82b842d1200ebfc9c14031c958. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZPLR2427436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b4a77776cb1cad8a50aab1a6a3fab640e20d3ee3a33c85c508e5ee225b0b79. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZDA62536950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b8087942486da820e410a1226295dfc202c0b99eeeb1c514ee0eb3c597d629. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA62536951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ed90258f33e24735ecc5d32b6e7c0639e8d7419542a9417013406dc3a0d486. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZDA62536953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1753b09d3dc43652a965d26a6c54e287c61ad1a2376d7e3b49544419b9a4b386. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZDA62536954.