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 0xa94e0245603a503af974b768cf66817d182bbc790b1c885767c0799718d71007. 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/01c8fa6d-2778-4ae8-b068-95e7f55d62d0.json and https://artists.proofprofile.net/proofs/artist/01c8fa6d-2778-4ae8-b068-95e7f55d62d0.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 0x7d52c40d55db49c0926f7f23b2b57f3fa638cf84a7672a014ca4c6062cdf9deb. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/PLD171700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85efa2dbf003a601c20ad946d36e2b7c81f54d7d3a851dc5fe4319f391f9c8bb. 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/PLD171700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce9201e62b9ee6d3cf95fef8050710081b0b931632c65628f85f7b08832d467. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/PLD171700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ff964453f5489d6a045629742ecc2bfc2c4ce4e0592ebdb7327a0fdf094822. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/PL95J2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d4f92e9dcf1bd2cf8081013f078715c33453d3ab08adb93e67746f1b7b4435. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/PL95J2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1517ef1769c01c0e0cbd414430083a984e85b5285cdec7af5e517fdfd8a29f0d. 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/PL95J2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ff964453f5489d6a045629742ecc2bfc2c4ce4e0592ebdb7327a0fdf094822. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/PL95J2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92bb3da2bdbb0c41419de7da85fef8970c928523206e36368892f2cdd7a653f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/PL95J2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c4f10c38e23601c9262d66241d042361fc97af7e4f94cba038fccd060081cf. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/PLI368101980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295dc3f9757e9c2a141304c6c5573daad17ac4646708e5718a57de6096cf20b2. 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/PLC592100181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c3f741e8b68b2c9517b30952d46ec83a2d69762103e91c7fb9ed82e833382c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/PL95J2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615e9a6b8a98e6c567785a199e928cdaaf53758479232b9bd8bfc31ea7960d8e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAIW2409108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d7e6c3bf8b287aeb4bc39ee19f0ee17c64a915f4d2458e221d0525fff8fbfa. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TCAIW2409176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17421bad82848dc91a50bff9f82e4649376c78e9d756352288a6df778bcecbc6. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAIW2409189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d14bcc4851609e4a90f1df235645a2a84becef6f2229427b087a914c76d4e46. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/TCAIW2409201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0e0a2ad48ad5419017f3dfe87d31ed656642515a85abcbe81d16bc9ab8dd89. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/PL31T2415552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b165952ba23f06cedb3195e089765f59a83142b08e8576a23d3174990da0dc9. 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/PLR862400534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b165952ba23f06cedb3195e089765f59a83142b08e8576a23d3174990da0dc9. 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/PLR862400534.