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 0x3364c83b63d7036018ee6dc57dd3a49c8aa40da81b1c10cf6b09fbef2cb99183. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8d33be8-e77c-4296-a498-94fc7d75d023.json and https://artists.proofprofile.net/proofs/artist/d8d33be8-e77c-4296-a498-94fc7d75d023.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 0x72cf0ede653d2298b8095f2719411f0876dc3d7a7cc93ef17121e81da40d300b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZZ8A2423933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266636d9a1b4b14ae6d1ec460eb52dc43c57d37b7ae90daec905ddd2b614ff94. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZWV32459495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e40e5cae349b5c55e6d84ec5b4341d6b3b80fcf49a8a06e8771c968213a9a3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USLZJ2405447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e66d44dd7232b1ee3a63ee8e38fde1e550579e85fb5387d82439e84e9fbaf5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZW9L2321499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1e360e814539f777ce517499d01ea5204de61af0bfa86773e3bc5b245919c0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTAT2259866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1eab5f284895a32bba6b8159ed8981ea96781141370a6c97b187b624624ea0f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ5FN2340599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817f8059c2b08a91153024c69f851bd7dc496e9f7786f4114ae7f4e1092fd608. 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/QZ5FN2340611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19af943eb9bab1fd94f943cec2c5efd0421e9246b0737ea1cf5611e1704e0b5. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZ5FN2340613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0b5a0ae07445d1d5fc37618a18be648833c37b41562356662d4edbb17b2346. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZ5FN2340629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10b4689b126c1c0a120d2570fee8da34c4268734ddd0597ee4b4dcfca0bf992. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ5FN2340637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c87bf0144e5b26fb5f5b8c7dc372aaf97da8a8cb023df91c35dca6afe34032. 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/QZ5FN2340648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf62e658e40f98aaca62cffdc25769a71f889cdfa89cd3a87a23d52089d5558. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ5FN2340655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336fe5189c36b2cdd8060ea58192d151b2e97418e2f5a83beb8c91f456adcb33. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZWDD2224236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36cdeefafb26f51d58bf1d646128b6a2a814fc709ace6b01cf17a39fdee4bb1. 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/USHM22225246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c864d16004d850f90864f9341da7bd55f2232cd993a34a94478242a1f96b86. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTL92389411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e32d7046f720166ad68278f4f2f5dabf1c79a64942bf45cc02434047c81d85. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZMER2280092.