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 0x63fbb8e86d58e158b63d2f9e0a14e9d6efb8e5b6d75151d4753dff82acee412e. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33035bd9-8390-4389-90ce-91d21a58769c.json and https://artists.proofprofile.net/proofs/artist/33035bd9-8390-4389-90ce-91d21a58769c.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 0xc7d10c723e53a6895b417b178886b68312dd9340867178dea96a3b850a727453. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZDA72398861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633147a165efcc0b8eee312dfb8b059996a636b1f111df2e9d2980da7220f33e. 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/QZDA72398868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0824044a3d635e7499176ba7c91f8b95a0ebcef8dd77bac2e670de6ce6bc0846. 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/QZDA72398874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa5adfe7a9d25899dc2066bfe08e92a2346bec43ac65042a0ff9ea475d1b3e5. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZK6K2383431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfb3d3f94d4c227276f68e076e55d082541bd90cc1cd976370fcb9196b2103d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZZ7X2406976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1500eee716f0ce0bdd67f4f1f0fb5b53ebcfd8d31b03436cb25926a932bcb807. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZK6Q2570979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ac04a1ab9929dd36799e530188434b822665f8a4191d427c8136d059e8e70c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6Q2570980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb152bd0f039a62d9678b356e972ae7f8fff44e1226de4191b2aa671b0a10d420. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZK6Q2570981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e03cc60b08fb41e5dd05155db8d6524b0c7354e06d286311f8e4cdb846dbe2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZK6Q2570983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46912a9df966c0efdcf89d5ee733490b73f1292b14866b14bbd0593c149ee506. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZK6Q2570984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6719a346be6a2afe68c7fe3cef1367f97a1d23f74a2d21e3d54e46521b857b4. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZK6Q2570985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38b8f291612434c0e89bb1c65b9bed5ce21286632a20bcd72640ce2b02c92b7. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZK6Q2570987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294635a9c80d193cc502f0ce92dce737e7a42f0de4c97d41930541dee9cf91df. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZK6Q2570988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4d1462ff4008ef105b9f882188075a4f18e5323a23d63a69fed0d3d3561b3d. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZ7W2581093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92fd21d9d7d2e1175134043a38bc4c617749ea52a402302d617c929d54923c7. 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/QZZ7W2581098.