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 0x8d0cde91e0b03a3338789a1ca27750384b7e43a8962dc82c470a15fa48832627. 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/e41d35fa-e766-4dea-8f8f-031cd28ba5a8.json and https://artists.proofprofile.net/proofs/artist/e41d35fa-e766-4dea-8f8f-031cd28ba5a8.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 0x97b235a19f158caeb922287f7ec5112d7db682793d80cbc4ede35a94deea7f44. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWW2433926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f859c66b89b9df4526b2bb79289b41e7595cd948ac72ee304ae9fc273fd086. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZNWW2433928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6043a6f12fd9d54287d78edd15d4eff952a304199b09c27739cbf0c754082f29. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZNWW2433929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09c0ec484770069f67c5991599c78784d216e5233d2767a57a41ee8d99cf2bc. 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/QZNWW2433930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cd0cebf8fdaa387868640c7092f2c814907fe8bb34373ccdffffb980e47b97. 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/QZNWW2433931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505a8ab58665bd6e4d6f78e598fc54ebd7c32b574888ca7d8e2b3eb7fae208dc. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZNWW2433932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de396b78eea4f4b5c352b4eb884d334ea0ad1d2f0b7437b224da42dc41bb760. 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/QZTB82446605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39874d8dbf3124ca3cb26bc995556215ce11edc21eac6f4a767a49d059353a23. 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/QZTB82446606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa531fdd197adaece9c756c48345ca8036dab4e7dd529a63e6e5702868d5bb527. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZTB82446608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc81ac945d55018bf5a8c4695a484ff4fd52c5435b61a0299ddf34d8d105a82. 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/QZTB82446609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c210c1b5d305e94749360fbb27afdcb077b28a12804da079308e387a47fda5. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZTB82446611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03fb845734af0cb79f5ae8c22c47f62b57334287314fa76591f76d851a67ec2d. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZTB82446612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f97a76226ba9437bb6f6f6a0cd5a2e9d0104ef5c8e95b78dc8842a71db48fa. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZZ7U2411661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff4d1b2fd64352cd91d48313126b7e4107e7d515b809abdfbe3f2120e43d211. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZZ7U2411663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef8df56722ce61e4cf640c5a8c8e4a558018d3ea2696305e52cca9dc3d4d3df. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZZ7U2411665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198c782bff338af124c193873dfd758e407a90c6c9137ea45d64defa678695ef. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ7U2411666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde54bfa6318f0df1cc35ebdcfe7cce3a04e0524fc74ce07f6005cd0b0289a3c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZZ7U2411668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d74e8bab16b5a4072eb630035cf3565aa72f78e888d1e8b25bc9ebb95b8accc. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZK6G2572002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80aa1897db31723ffd3f88b397e739aa564553687a1f74db655b742a4b6d81e. 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/QZK6G2572004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ff2fee0db2d34a543029ebfd4343c5dd5c9ee3f65df7ff3c3023721292fdcb. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZK6G2572005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9c4b956e91ebac5eb1b169302f462a46469226f21ca76030a7a00310808c17. 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/QZK6G2572007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da5977229d2ef9baf7c6562a0bd9ab15c0933b9939ced57ac60bb9e800d2c6a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6G2572008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f5f779ae471e3bfe95f41ef904858edf98a514552cf26d565ea5cecd06ce74. 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/QZWFU2558488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1794cbafba9150a5e138247dfab00535944d072c8cec9f7ed4e5cc264406db0f. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ792543066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0819a8040f4b371db8d8f482eb8c1c2e1b9e714413c81ae8ec58dc22845959. 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/QZZ7S2518861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee135f03fe7f42ca91cc0bdacd2a6b0fc0a4c0ea143cd694d49c28bbbd98591e. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QT3EY2562193.