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 0xd8ff202cfc77c531e993f30ecc9d284a5b9cc7d532503f9568073eb126a2a059. 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/61c4679b-ae92-4c85-9ce9-25ff56d1753e.json and https://artists.proofprofile.net/proofs/artist/61c4679b-ae92-4c85-9ce9-25ff56d1753e.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 0x9f35b0bdea68a40d944b142141305b7cc5a64bed297a82d0eda70650dc029bca. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/CANOA2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c326c9c3cef543968861233044a03e028bb2ecfe9bf1164fa68110660e62c4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CANOA2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7217dc95b4adb7d349f1a987a199ee8737bd47adc2137ccab0802f73e461e84e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CANOA2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68250cc932309d6e62eb7a4fb20d10fbd84e2017d2992c50566e248fc1105dd8. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/CANOA2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a5df3d1108f139f9c51c1600faf8429471c9668d3bc831b380872d8b405304. 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/CANOA2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f35b0bdea68a40d944b142141305b7cc5a64bed297a82d0eda70650dc029bca. 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/CANOA2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b0b43fa864891b87c26b335549aed29753742e4b11dd126b0b062c35c10120. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CANOA2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f66ff8dcc03442f5880f5d375f4ef497299c40f802b4530aefe6dcc050a4cb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CANOA2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a49a88ff8851d831fbe8833fbfea3bb267f8cccb96afbc3880cedb57053a65. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CANOA2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c721bc24a57a01753189d277725891942a48b402cd03609dc709defd55a586. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/CANOA2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb78ed67cc879fe89694f9ffc6570c4cb3091b88a5d1a8c184c4d4312fe69bf. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CANOA2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277eb618929de1cd945dfc85f7cc294a8f38d63a1fbf3934e3d3897a172c1dda. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CANOA2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad06b88ee578ca30dafa4d7cceb9beaa07282a0ca657474fb45ef4dad6213f9c. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/CANOA2000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34845904abaee266e593d6a0da4e53d4e5e10e1ec6a5bb0d3bea3e89cc9f4d8. 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/CANOA2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2592d05acf27b122bff88fe11b1da6ff3263ce85b862cd6bcced19a15e1a074. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CANOA2000025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fe9e722a45f1d7da2fc1c88928d46b77f09a2ac721bc042ec86a9ee828d640. 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/CANOA2000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f54c3d0b2319e4b9342603893b43804cacc2da8491b9d814bc1cf48df966689. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/CANOA2000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ce08e9cf45e8e36cb6ef8c1db53f1af49d0c2f638588386b0707988c8d5c45. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/US6QR2300120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ce08e9cf45e8e36cb6ef8c1db53f1af49d0c2f638588386b0707988c8d5c45. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/US6QR2300120.