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 0x2941dee4cc1f68815a29e6468cc1308420d943bfd4c5d4b9c01c922bd105a270. 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/009baace-223c-423c-81f9-92f0c1886df4.json and https://artists.proofprofile.net/proofs/artist/009baace-223c-423c-81f9-92f0c1886df4.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 0x09d364442afdfc2870ea6bb8fc69dd3a63e95cd2582040a00b07f2b8e9a5ffb9. 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/FR26V1407575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4722f268e9476f3ed0c4c57c45ab1d027e5b22e6df75dc422cada2474fcd5b31. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/FR26V1407578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9aa9f43fe3b6adf368ecc4809f936f362d2177626a0edd0ec687e8ed21c964. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/FR26V1407579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce731316300dd8ea632e61e724ccb80d34a6884fd39ab84200446ab89f163688. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR26V1407580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38cdc05c9cb2fb26dfe613f3831670b2a5b6fb6182e813f021be0d167cc79402. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/FR9W11300465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43436abf623cd5bf7276e805417766e8695a85864ae4737774aa103c5ab9c90b. 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/FR9W11300466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db768b416ebd53d04a7b3bd4569d6e67fe3f929d98a0e6ad57c236cbc65b14b. 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/FR9W11300469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4516f295a1baf74a32b37780e9efada5e8e92aeedda17659cd89fdd227f6988b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CH6541705426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f03035de1fb6ec69d14075af0b73055f8630d38b7ef5f276b3b580fdf07867. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FR9W11300470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3419250c0a98d0d10c49e282298488e57d86a62d2d7474c4e87d9e8860f955. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FR9W11406240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490126c119f933235e2d9694e4cfa2274ade8290e74adf592160c3196ee0978f. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FR9W11406244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2b61d50ec48601ac20530f17e658e3c3850af131ac7f4aacf316c330a7c814. 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/FR9W11514690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda20f9c1056d1f6c35c7926a6ee6c50aa27b6fe93455883841de1f799db63c2. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/FR9W11514692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa5f5c5c170eca9297d3dfe4518684d3ac5ce9b58654184ab2687c9bde942e2. 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/FR9W11700752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a5b1ffeb905655cb2fc18383e52d1996da397a837e809a245fccd6eecb352e. 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/FR9W11700755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03a6756ba32d677a5004de21499a4d22153c414ea625035f62b9076591e4a96. 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/FR9W11700758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9191e9488512a7f8aea716dc981f657c2772da6e9c464f7e4aa183668a9c2f1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FR9W11700759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf51d907cb17c2a3e492c290931ca69b886d89756274874738b0b28a79ba8162. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/FR9W11700760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189b766d84ac32336b21cfeb4bbe8e5136b5dace0b103b25ded966646bd4cfd5. 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/FR9W11905016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c17f50e0cbfe8663e0b9f8f2499f6697bde7b19578b5d4ad68b36ec1866955. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/FR9W12004361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa850986b7ca982b0f1d96681a88e87146aec67efa1566020373cb45dd06c78. 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/FR9W12006231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984f3c39a348bd16b593e0f85da5712f3f89a8dc56683785078e4a2eea2a9672. 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/FR9W12006233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e415860aa0df54853a72d926aa35dd51149a3cc2d05cb815f607e2e2dd55f6. 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/FR9W11905015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0447993659931a9f16a77aa5cf214a8d929b8d59035450e0cb659eff553a87. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/FR9DF2504001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0e2d8fb10d085547f1177064ec54d1bf72634c7972e365694e5bb62419b6dc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12216760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0e2d8fb10d085547f1177064ec54d1bf72634c7972e365694e5bb62419b6dc. 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/FR9W12216760.