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 0x74a9e2d21bf860654ae6bedc01525f7963e149fd46d17c978732c7b9a0742b25. 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/40675437-1e2a-4107-a467-56ed390096b2.json and https://artists.proofprofile.net/proofs/artist/40675437-1e2a-4107-a467-56ed390096b2.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 0xbb73e2ba1e75870bbae929793701fcb0c3b3858cceeb11a962ffbe1e2b9b4a63. 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/QZS672251956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8d72aee02999765c0828d1364c6d56fbbcd3fe7ce8a6b4aa01598f3a434521. 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/QZES62386432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb8acbbc0760ecf383298f44dd1a493faf21c2d1ba0890f227ae383b274ee2c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GX8LD2332075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8eff720926683f0cf84a8484ad9d99961f74696194e7b8a6552c6ea0fed86bb. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZNWT2343489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbacd7346e0ac5915c1e4d42b4a1bb7965ea22eb62b79afb4ae6e8fe02876a961. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTAU2317356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e4d39f05c72b9d535708f45ac4e962447a4faf95a7551e642d352398037827. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZTBE2353287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77826d82546eb7729afb91aa27ca72fdf722a8e225df69a517bece55efb6dccc. 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/QZWFJ2306533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec651ef3b3728e6c843974420f151014beadecab5f09602ee39568ed449d726. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZWFR2319819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2a711ea4b5b01702521a0f05e1e319fccffa05c0ecb1685d49d5668e8bbf9d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZDA82477362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf5c190ff4fd7635ecb5f007e9bb18aae72749a1b957a95d041c0081755bf8b. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZMEM2492450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bf76938d4260f27427aa2452056dd49f9a517f7392a6f406dd6a0bd9c20784. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZRP42444930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8aa9c5119f6752bdd54547698edcc53f7a32f39446f9081f03582593dc57a1. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWFT2433755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399a41783726e111db1d8f2aa1ba1d2393b6d259cd9c228d83e360c3e42f1bb2. 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/QZDA42529305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b5b093b67fa92810d0b0dbcbf326318827df50268eec09e1e61c5be0da8863. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZK6Q2530569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ae3c2de5177b33c9825155f96cfe5998bae79d872be979b93cda645606acd2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLT2H2400393.