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 0xcf0afc3cb2641b30c5de9e80bbfa784e60f032f64bf32228f38e5edb22d56004. 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/3d79f6f4-7280-4011-a696-f554b0a2a126.json and https://artists.proofprofile.net/proofs/artist/3d79f6f4-7280-4011-a696-f554b0a2a126.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 0x399c1cdc88439544d10d9df394711ecfc4d784e974cf6cb3493bdb13ce3f5fc7. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/CHB641795801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85559f67cf4cc161af5c40e05bde0a0a6d0f946a4843e4091f4fc593439a0d03. 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/CHB641795804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f90c0217e2ac6adcc360757aaeafe6ec55ee3d492ae19bbd2bbc0b8f4a8b9da. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CHB641795810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6752828fa37d13ec8e2a94a57a407ec270e2c3800fc2ee74a96a932bd3f3ce73. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/CHB642051203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd961be333f62dc952bad794d08aa75cdc2348822ebaf9eb4560b7364daf4072f. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/TCAIV2488608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8ab7c959b2262bdff0471787e9efea507dcd9a801f4bb7687d1863fa7a73a2. 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/TCAIU2488680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392c87c602f6f12b67e14475dc87db6db2726ea97ff2e11ae9eee0a1b6f5609b. 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/TCAIV2488741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d3880ff936a473ca293915b0a3aedb985b0d5b424979e825fce0fd56fd4144. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/TCAIU2488785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485cfd5c46d3dbc2a01b23d391bc72087e4a8e5851687b76d107ff8f614c218b. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/TCAIV2488854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c07679b71566366189f8b5ccfcf935c44e61a027b46da9f794b13f599351401. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCAIU2488926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecb759c14f172f2ab08e8b92e11f584620e9c48c7f9a07f59203ec87e1b8591. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCAIU2488983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65b9b2e1030272a74decdc873925679a3e57ddb3e74625c5bb381c7e4f8554f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAIU2489053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc666b653453309be7d0bc2f74c2e621f090477c2aaa833baa0843b29f885ec7d. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TCAIV2489132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef554472c1e12d7e9def43e22d7930263d5c0bfba00d250634e07bcec689f584. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAIU2489261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ac39f22b51cf96a93fa800751e956bdb950f7b0cdf755c142e6f3868f9a929. 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/QZHN92501710.