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 0xbd87b4defe68c38203f3387cf53a502a74572df8b1f2c5b9664c6844a3c2ecfb. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/28c4d2a2-1475-4bd1-8458-da4a34158efe.json and https://artists.proofprofile.net/proofs/artist/28c4d2a2-1475-4bd1-8458-da4a34158efe.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 0x2020a1a84c7c7134d8c2235f486699b9a72eaa59baf5d4bc5a490f00aeca8bc2. 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/BRTIQ2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4eda1427afd8d8ffface841f4f65bb6284db35e570b788309bfafeb24d6407c. 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/BRTIQ2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514cfcc7a566aac91a8de5ecbc198d6db6fdfa4bc33d6ed74ffe48581b03f201. 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/BRTIQ2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbc19f18a632703a7f278759f6934ae4ee0aa37e4a00a8f611691cf60bb7bd6. 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/BRTIQ2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270dd0d364f311647e98d34ca9c52ec868e77036a0dd4936d03e1f07eb092c80. 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/BRTIQ2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f27c9ce858639f4f5341a7fcdaea87d1fa2d05780576d537301e646c125fc3e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BRTIQ2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb30740b62cee0ca99e741a05cf86f4132df6f003042ee8207d040104f1ab883. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/BRTIQ2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2314857a40e6c8125f9e1ae816ed3707e1302f3de5397afe2e260ec643edf7e7. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/BRTIQ2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bf81604c4f49ba32284a73a9b148b4851f9fab0c7743e33b24aa8b5078c271. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/BRTIQ2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ea1b1f8999837a1f570357be293795e7f1797f35542dbdd3093abf679bcaf3. 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/USI4R1015921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ed42d89e608f763240c779edf40155026988012f3db5f57ece34abf7888aea. 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/US7VG1933963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97c1c04ae423b2612677b36820f6f8f5ae2da93e512ff3d37b7bff49c2ba78b. 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/US7VG1933964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2509bab17f593401d4be5b9e43a85c713fefa27b59de1cd4420b6bbe3f451c9a. 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/BRAE30300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2053018abfad2a46ada39bd1d242adaf7431471e7bf18c220f58eeaddd3a875e. 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/BRKYG2200151.