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 0xdff525329af07c6aa85001b8d59f24d25294024e1b4a8d9b41796fef6f5ef026. 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/3cba7b8d-a566-47b0-9d1c-727e16c9cb4a.json and https://artists.proofprofile.net/proofs/artist/3cba7b8d-a566-47b0-9d1c-727e16c9cb4a.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 0x02b5ea87f72c63bd8d37ebc90c6cef3ad034871f44c6e7a58ed14347ed701a9d. 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/AUBEC2013445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ed9e569fe5f668fa84ade3e08353e4c7effabcc7a97a48d609fcb487cbedaa. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/AUBEC2013449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bebd4e2e00fb94e901f3bbac73bf6576a6f07463631c4de7e6750bf9a9a5043. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWR2016919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022d89e14a65a535ae533731b2b3886f6d9346911e32e449e181572e6cd567ba. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZNWR2016922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb66f6166f6f3aced627b4336254025988a77073d5f4bfd51db1fad63ea76ec. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZNWR2016926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2334b4b0aab5911c88af4c7a8e826ff9f65b1eddff1b24e88cf9e163796a8245. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:01:42Z), 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/QZDA82173559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e52be0d8c4d27c15a47467283153dcdd5d0f3daebe499ed8a9793c6529cee18. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/USLZJ2247711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef9c275a17e3a7eb3a8047651a34bfe1ffc20d68107ce62bb6326ddc6e28de0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWZ2238723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fae7916d586b10bea9aea97348f7f299b61d4db9d43083183d191c962db02c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USEZ62426305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a69b4bb8a41c66631f9f29deb69a1df780e63763b20a678ecc73b8d5c89c909. 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/USEZ62426301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe86fac9d295c4f2b4fe1ff1bd1269e350d7f7cea2df04b8b216eea05ef034ca. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USEZ62426302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7950053f961d38b1216f128ed909aa38517b712b3669906ee02307ea2122052d. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/USEZ62426303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a40fc573b35b84cff9f3e028820a4cad0c857c7c6afd3c66dbc8a9f98670678. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:29:17Z), 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/USEZ62426304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fae7916d586b10bea9aea97348f7f299b61d4db9d43083183d191c962db02c. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/USEZ62426305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05d3d1ec15944c446d9658f4c20b57fad09203b8233fde046cb3825c7662a70. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USEZ62426306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46cc017b1532c87e4a619e3fa306c71ecabe691aacb280e673cd73f9709a590. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/USEZ62426307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c6b36794cdf40db6bca3208202e27574e79ade49e29eeab200a232ec27b2e4. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/USEZ62426308.