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 0x929b0712de259056d4f78ec643f6160e2a78a6f620733e21707d33cce8b64354. 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/a69b7e24-4f69-46af-809f-62e24624d4fa.json and https://artists.proofprofile.net/proofs/artist/a69b7e24-4f69-46af-809f-62e24624d4fa.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 0x5664c1eb515f1de7990f3773b5a2a148310089cc8dbeb6b16e19d096b1f041a6. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/DK4V62201101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f56f9051941e493a0180a345ae7a430f1a4d280c7f8365cdd623911eb57393. 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/DK4V62201102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44e11ec5b6438d5468fa26fecfa2c5ba585b9caf9ae84f85579824b88402b55. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/DK4V62201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb3d58f5cebc9ce18ed158cfcc53bc1c442351bb974de85ed5412000c5e9127. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DK4V62201105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de2703467e496c370948870ea9bb2f9162e02316c3149b561ab9f54f0d5e405. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/DK4V62201106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44e11ec5b6438d5468fa26fecfa2c5ba585b9caf9ae84f85579824b88402b55. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DK4V62201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb3d58f5cebc9ce18ed158cfcc53bc1c442351bb974de85ed5412000c5e9127. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DK4V62201105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f56f9051941e493a0180a345ae7a430f1a4d280c7f8365cdd623911eb57393. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DK4V62201102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7a3c509e2077f2042075ebff891bcee917c1340fe8cffedfe4b5dd1af24d98. 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/DK4V62201104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81492cf783dc2b40049c671f420417a33b7e7a4d15c36f5ed9ecd00e82f4108a. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZNWZ2081696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0d86df408a9266a9efbad44e53f51c12a4a2d24b3b873ce0464ea01dc3ce5d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEN2046578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727f7d20c38689def209c1dda6c7d323db22cc63cd44491e46577bb6a66af956. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHN81995053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a65f22c1d162cab964103501c2a6ce614a30dc04d9e42242838e0132a430a4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN52089860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1071ca9d13ba4460181f43e1fc02591582d466ad4002940b92ad06e08ed7878. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYW1997433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a65f22c1d162cab964103501c2a6ce614a30dc04d9e42242838e0132a430a4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHN52089860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727f7d20c38689def209c1dda6c7d323db22cc63cd44491e46577bb6a66af956. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZHN81995053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1071ca9d13ba4460181f43e1fc02591582d466ad4002940b92ad06e08ed7878. 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/QZFYW1997433.