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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b0961339a70701369a97aacf86ee0ec41e685570ef9a1edfc503e33f2adc4b. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef1741f5-9b3a-40b1-9897-907ccaec42f5.json and https://artists.proofprofile.net/proofs/artist/ef1741f5-9b3a-40b1-9897-907ccaec42f5.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5cb0b2bf071734dad6b2d1fa87709501b1791e2a06bbcfa33f5d6c216d5ac3. 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/DED819987101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5837cb3dd3dea4701a41c50f9e7f6d3a26680ca1cab1175158a1aac138f49e4. 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/DED819987102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd2944f926116c4a7893c2674b9601541097158a1e5bd11933c0843a6360ce0. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:35:57Z), 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/DED819987103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266aef37161ea89ee3c024992fcf02bcacd2802f8a20abb6ae5ff083e142bafa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DED819987105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e77918853dbfec9d66475c071a48740af9263270d2fc486f1da17f03b55748. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T15:29:50Z), 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/DED819987106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a4a3f1707e2068b2a73f712e447330c4591571907c29fd387d21f2504f8164. 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/DED819987107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7996a2d99900602d6be33786292414fdfefa4624728c110bcfd7f58a534916. 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/DED819987108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f4793033d2b30fe44dd770257168bd1e2b59bd8f8a16238298285fd2f3ef9c. 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/DED819987109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cf5a7ccb717fbdb9fe5dcd584944bba6fcf43857907d82989df5e3bf51ecaf. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DED819987110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3ed93bcefc08aeb02f80ea5089aa157ae3719070c33f098643d2689a7c32ee. 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/DED819987111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea14429bd68c517661ea1ffd0e8ccfc39e9d3da8a58cb6d2660122638069231. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DED819987112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d3eb1ac6563c109dccea0a851efe67301fa97254f7e23d1d5f89519be957fc. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/DED819987113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ad31b059c9e0800fb4f0a4ad378358a04c60b805b2427a7d2febbffd0bfb94. 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/DED819987114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f6bab4fa29e206881d70625d4e9b2900dd27bf0e150d30dc5f50d5e5574159. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:04:44Z), 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/DED819987104.
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 0x5bc351faa1667c5a4977dc8c46a749e5b126abc22b3b743b456dac6de499136a. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DED819987115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95583463c06c7188224873605edd2991f5c52c9c851efdabce36d83307389d72. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/DED819987116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7ca5a1ba78820a615c133caeaa35864df2ca7cced3111b2984cbc71a0d3db3. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/DED819987118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5750066f4080dfef0edaca90c518ac605c0efc7f1c3029943cdca90fc60652ff. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DED819987119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1256471265f85ddf1707ab886d2f0973cb36bf85cb44fd84249e52f9888be855. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/DED819987120.