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 0x885e7cf2dd249643ffa97f85bc51ad7be68498979d4b6f29a43ce970f9a4958a. 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/b21bc112-e1c5-458a-99c2-35612f400c8a.json and https://artists.proofprofile.net/proofs/artist/b21bc112-e1c5-458a-99c2-35612f400c8a.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 0x245a5d1a859c6c5110db54bf7f594fa9ec903bc32ceafb9a5c27c48b6d816deb. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/DEA620300819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a58788319fb9a201338f81ce02146f09678866cc50a33e38242177b1f4db84. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/DEA620300817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd647ceb890645da1bde23cf29450b6756e4c73f73324e6afed469e41eb7f69f4. Chain 2 (Bitcoin): anchored in block 957608 (2026-07-11T21:00:50Z), 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/DEA620300810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655d38861aa086e69909c7a34b73730a1e3e55e5c22f8fac0a3092a6abf3d53e. 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/DEA620300826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e62bb8e17625da5e5a2831ed4bc886393f9c4909448faa65674ad292eefad0. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/DEA620300815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1563829276e692d4bcaf15fa80474314361d6911c8a21096467c0ac9a31f31. 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/DEA620300809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1243a3e9ee3a367ccc4c5ae1eee36550a348dc385331b2c10ef27c484739455f. 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/DEA620300813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca64547b5950838d935fc4b08756bf21c311268f34920e6c3ff8c280bda37a35. 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/DEA620300995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4fb8deccb17781337330a990b59b2d73c8f5a5da43b6b3ae6e386cf938ebc3. 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/DEA620300996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9984c94267c3998bf33cee7929f525d2e52239ab9ac498692cc10114b0a0d0ea. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DEA620300998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8aea261183a9012a8142adecfa9ca9f85f74dfc45026541a6318eaf4ed4c0c. 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/DE1JN2407900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba956f689181c808ff24306b7ab49b0d84b522d7a9e91509f4b6edd7c8112cb. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DE1JN2407720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936e6eac874bfac4656a469b79a58139306ffba709183bb51f9fd70df815997d. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/DE1JN2407926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0b327f06bfb4ce3465f4f14e7fc22fdf8e591b69704b1a6e984bc715322f08. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/DE1JN2407885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0740d289210e21769912d8fda9eea6592e22d87c1251f45ff26f8c7917743a56. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/DE1JN2407724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575db781313803d57ad8522bed5aaa3e8ba657e23e20a407770b5ef6ef25a6ee. 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/DE1JN2407843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad17aff0d7fff02fe70c3c9d40f38058dfe3192abed67535d7bf4dacdf0d2c57. 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/DE1JN2407727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf1ba2dad13420ba063e4661bc36bf5a4cca466d1f95325498297ec682987ef. 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/DE1JN2407883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb846a8e7d65b6a27484766a90a4022967be1f93540da017e9f8cfc89b71d1356. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEA620300818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1563829276e692d4bcaf15fa80474314361d6911c8a21096467c0ac9a31f31. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEA620300809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fa5f41b42c7c8dd161006a63fc2d2aabae34f1a4cdbfd065306ccc415bf672. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEA620300806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45a14bfc43e9cb14ed88471016e50c50d1b2c01f985566cce27e6766806c5c7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEA620300807.