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 0x7c6c9232670674dad044e9fc0ba8ec276e5a5a1148054753a2a7af1df77a342a. 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/fff2bf17-8f17-4038-a37f-ebd26e8e4e03.json and https://artists.proofprofile.net/proofs/artist/fff2bf17-8f17-4038-a37f-ebd26e8e4e03.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 0x3133aad877f361e068d83c45e1b5a8f2af8f7f545f3a4fc75da13eda1ef7bbd3. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FRX761593694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f72c73315e821f16ed79024f5f1e472f80d45b71fbd57efbf661062953f8b86. 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/INU251600885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d19ee1391000fdecd997fd766fe6ced243ef81e3882dd0e1f74442a8d379a9d. 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/FR59R1928597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909847680235ff4498607594213bb728bf40725475faaf43e4df84f03178e144. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/FR96X1960609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48d64a46f059df0740b89757ad644eaed6f627bfa0cff850f2e801e6ac0a43d. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/INP532000320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81fa2f73303e2916726f217d05e7d2ba40d7766debccaaad8c1a03d8abb6008f. 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/UKJ8H2009995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32be3994fb7f572afc96a46e6ec6d7c0acef088a22bbf5502778e9ad5f20b4c9. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/INP532100131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3483e3d1f2e5fdcdf62ab601f4f7994db253de914540251781ced66abed53da5. 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/FRX202266026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb41ead1cc670f82ed0ca0cd53ccad1c7ea6852d68c639c21ab2b6f351bbfd4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAGS2206860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25c3b1ef03fd38a7bfefae902ed09b24aed3b692f1bc3bc67b6fc14bec22bdd. 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/TCAHM2318751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7b54433a56f026d4d3efef719536ec6297504d284b20e509eeb21b3f8087c1. 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/INT502401773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6866f37bbc54973e244a9f615f877fb18033a82a118fe8ec23152ac9ab53c318. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAJE2547643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78096c194cdff7f794d43b3fb0973bc9651bf024c259096c39f21e00ed5f1b6. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCAJF2541365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09765b21920ea9325a3820acebbb84e35db1faffd30c6d9480a2e3f69ac367eb. 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/TCAJN2505393.