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 0x1a3aee71c58b4bc559b099257c5ee060158991027d42b1c1912ceb0542cd0e39. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92dd7fea-3fd0-4b3b-9ed7-9baac0fe179d.json and https://artists.proofprofile.net/proofs/artist/92dd7fea-3fd0-4b3b-9ed7-9baac0fe179d.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 0x930fb14df5d523e8eeaf67be14f441c760ed3cb7b1cfd05666197e984bd39608. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/CACWV2557918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5199670a2f159458ea6908a84ecf90c15d8e32b6b9a7abcc27f6b09895c744. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CACWV2525775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a0ca9c6efea6a039fefcfaba40650fa8b27023919cdb3782e6f1d0b5900b23. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/CACWV2525777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b5e28e09f919cd6112b268ce2a946a44d7afe72cb085ce6fe449be1f156498. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/CACWV2525779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1a78bdc990ed8ec30944da65e30ef7174ad5247daddf4a382dc66986672f0e. 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/CACWV2525780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e08206c6698ec71c15349261b398fe0cfab21f36b31180c7e7dd942ecbc7626. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/CAENV2502869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ccc6cc1f795a22d3b2459a76da16491cd2762937a2c59f69cd2ccc5e0e1601. 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/CAENV2559945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75501ab1f4de865e848a954fd9755667a09077a787717adedff32603e3f22a49. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/CAGOO2597068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4367e78951468e8808eb540daebf1b2fb4f222f3ca68cfffe31075df6b11845d. 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/CAGOO2597070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa679509456773bee26a05d7a7e4a12b879253a47cb85a8dd769706b85e96ca41. 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/CAGOO2597071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b33d51cab65629a3f6371c4cdcb02acb6fa8515cbc33fc6b1416bf0fc7946a3. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/CBEYJ2519549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59f4fa833d85f8d1f3dd411d7fa0e670bd07cc85fb0be99791f928c14ae26ce. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/CBEYJ2519550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a88f6adb73ec6861e8bd1fad6a4d0cbd757d5ccc6d90e7d6c8abde109ab10d5. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/CBEYJ2519551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf61b9f84b0b4f4003efe2df9554183f154a67460da4cfd086ae31c50fa595de. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/CBEYJ2554475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21b1bcd2772f9ed1f7ae5bd49ed783be7ee399833bd91c9b91e2409b16500aa. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/CBEYJ2554476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ef7d81d17b90ede06b05e19612632a72b8b4a9d95a74b304b3bd3a75e89cbd. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/CBEYJ2554477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf11ef3785112d82331a2e62585f06a8dd6ba39e7015f713e60e690b88183a8. 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/CBEYJ2585148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf839bc7fb317bf204af5c347fcfb4163601c027e4c1211a210ce2ea37ed9e11f. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/CBEYJ2585149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468ab56299cf51ad8f8d0c15cff9bab93159b96cdb882c2d24c32f0331cac1ec. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/CBEYJ2585150.