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 0x5a0ad6246af8b2404a41838f68768d1eb595f92c695c5b9f71989a18b52ac26e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4892945f-b4fe-4c10-9fb0-465b81b3f7fc.json and https://artists.proofprofile.net/proofs/artist/4892945f-b4fe-4c10-9fb0-465b81b3f7fc.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 0xd2ba2bb7825716513d8988255582317ccd7a0568998970f14d23851824399d07. 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/TCAHC2311313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f362f4dbd29da5c15b220187232512291d468a91bff1294c265adefbca1228. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/TCAHC2311319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ca275c51a08c1f981608237e89563105796d84486b1da43c1e3c823bac267a. 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/TCAHC2311334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6160f3140833972c8a6cf243ede5fc66d7021546bcb85362630812f6f73e716. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAHH2347953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22508f10878481ff1cb21e344582690834f8638dbbf662b05dad62477fca827a. 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/TCAHQ2326178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25863f6ae2e34286c392cb1911565e7b2b7ddaab28d92526f16e18e7166bbed. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/TCAHO2310903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64728613084c59a37e7784a6bb0c3db3e059272dc7ff6cb4b7bcab329bf1f5a1. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAHJ2345541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586adc4f958c4bf6f306f5f041a458c442eb88af8bd9d1cb90e24a30fc72c1d8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAHQ2326216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8942206b5b98ed59474490dbfeda6f8c7873eb945e00e48c96f2bc476ac86b51. 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/TCAHM2359677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19975c38cee4af660ea2e027b8f485cbd32624999dfb165e6e73120eb0735139. 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/TCAHU2489404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8728f4360742793fde0360538cf4a0ea3a2a9e3502718387737c63a4ed25c8a. 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/TCAHZ2425170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda55ec15ba2a9b11a1ba71b77ea1e84a12af358b207da588007d6be70c62e06c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAIJ2406616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32d9d2ac80a6073486e4108ca6714b22b0b33ab609ba1812b8749cfef2c5738. 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/QMFME2484665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36805037d98dc596924c3877d53f4b469e56a46e4c36f8bf07b18105092e51d6. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QM4TW2570453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36805037d98dc596924c3877d53f4b469e56a46e4c36f8bf07b18105092e51d6. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QM4TW2570453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb85e20e0c6c67bd014deea250cc77bd91e5613ad93aa1fc4238834bb51bb2d9. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/FR9W12518581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318eea75133eaccb1b38adc731da98afb1f8e63f979b6f49e910809a166ef4c5. 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/FR9W12518582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32d9d2ac80a6073486e4108ca6714b22b0b33ab609ba1812b8749cfef2c5738. 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/QMFME2484665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa5caf20a3bd8ad718f889c8a7889329534bd7611d8e6a2b7c2caf6d684f69a. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QMFME2484666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf72b27f23fdff196b85170160f37a83c6f976acbf289b8d72ea1f1e58e6127b. 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/FR9W12505820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3828f26b467f7445659a1dc1809603dae26057649e2134ab7a87a98168ddd051. 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/FR9W12505819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318eea75133eaccb1b38adc731da98afb1f8e63f979b6f49e910809a166ef4c5. 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/FR9W12518582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7899450c1c3a993f1b40ce7e2f6805cbb2f6f955a6d1636b25465697aecbd88. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QMDA72587722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c7623b4673b528bebb2fc657310b446572af6469b62a4e20df4ca50ef898bb. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QMFMF2501707.