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 0x670c62943b5c45b5484e8d30933cf38332cdf8a853dbdef46bea5611ac2a990d. 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/a08dc42f-1025-49e6-8c7e-35495e6c4059.json and https://artists.proofprofile.net/proofs/artist/a08dc42f-1025-49e6-8c7e-35495e6c4059.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 0x6a4708911c8e1fed54e43f49672123ac6b7d3e54c9ae474ce65361e5e82dde6d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CH6542202840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabdf72fbd73b89e505c12bd0a21eaf5596c2268d8e0cb03c2a608814f15bc86. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T13:55:57Z), 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/CH6540897220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61be1f7b5e33b876300ec4a5ac31383f2e07fc8a598aa16c8a340096fb6e8f9e. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/ES71G2329238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc984641b8122ba57de91b02eb3753b766f71df0e0b1814e522eab93e34678286. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/ES71G2404871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf687b9c341a59e0eebb19f3ea038843e3240d7a953ccfdea18d23d93d3ac649. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:19:44Z), 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/ESA012579832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8321c76bc7390004802fe4c7d5e5f88fe638c4cdab1ed8183c7cfcaf61166250. 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/QMFME2558336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8321c76bc7390004802fe4c7d5e5f88fe638c4cdab1ed8183c7cfcaf61166250. 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/QMFME2558336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd10a6b7b8a8f1d80d8729cbb03e1bedbe38fb1c17e0faa2471f0325dc85d896. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QMFME2558570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6ac150619d392f54181015b2d6b6d919246d706fb203ec7d3413171b6adcab. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QMFMF2569890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0ab2b3bafcc6ffef5a6cf8b5ec3e463947518709db9c380955dad878b6ec6e. 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/QMFME2561637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a229980e13a717282beaba358a9d521291cbea73eedee102de7bfb0f0c885b8. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QMFMF2569891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607f463998a5d2485ad7c270353f1ef78b30a38180adf0598107228bb601da89. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QMFMF2569893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c99aaec267f16a37c18a1be8aef39fa333ed1cb16af58f56ec63ac1f4c51f9. 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/QMFMF2569894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081793d667ccb818b134449be077e954cfea6beffba2d930107dec57fd7deba9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2423720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9075300824b775097c6fc9e4a03b24451d7165775ea0bece382a3480ab705f98. 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/ES68F2300117.