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 0x392d22076baa32d748d2a6a448449ab685794b0a581ab859aaae496be861a378. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd67cb3c-44ba-4e2d-a5b4-ff37d0a05560.json and https://artists.proofprofile.net/proofs/artist/cd67cb3c-44ba-4e2d-a5b4-ff37d0a05560.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 0xc22d7cd7e560e7dda5b9aef1e65ca545135d23b97a9c3d259729693949140c67. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/TCAJG2586447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f60dc5a8b3d7c4bffa882684d48ccc0bbaafdc2172218519d2d9d135cc2f343. 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/TCAJG2586460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896c4dc66b2698e8ca88fd9b07fab3c380f1ec7aa428131ebb7b7ef3fa9de72c. 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/TCAJG2586471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1c0e069627c72b32dd93f20e735eba65c48a1ba4a82a88809f8ab4734ed8ae. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAJH2586496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe476b59fa6f23b03f2a27d31fd52296ffa9f616a53ed1a4e077eeb4f9b27136d. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAJG2586536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60636dbe94e27425d91b627e19e5284ea23c3c49c1e2231c7f66e22a4d10dafe. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TCAJL2560516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b67fef3034153a053c47f4a44e2cbbb63e75dbe0adcc068c8615a20351fb5e3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAJL2560552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f532354ad00d999db59ef26a7756c933be26cd39870dc2955f19665d3cf57e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAJL2560558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b3889d36c60b212dafb33a39b9be3a12b8ec4d2486e1e7af73d7fd26e12da9. 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/QT65Y2595961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6459167653195640f7f5302c1d70d8bcab1e7bde95a3d39e9f9ae83f31016c. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QT65Y2595976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ba8d0a4974504924b3f59d3628a78b8be4fcee0ee43444c371c0f02199b32e. 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/QT65Y2595989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096846255596efdf89c28450ac704b13618953ced768d9bed897e927776d7cc6. 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/QT65Y2595993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e0cb46e0fd2ec1da961417f5cf9d1d5cadf9fe51d4fa74214ec694aabc7807. 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/QT65Y2596000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b05093e1a50fed37dd0732c155d22b72d268a8da3e4517cab19c698b1bd2bd6. 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/QT65Y2596010.