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 0xef26826aaa15aa9da57ebcebff69642fa0a1f4eca1fc6100851d3afe9b222966. 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/91495a04-ebfa-4f89-b1c5-7f28b88fa96d.json and https://artists.proofprofile.net/proofs/artist/91495a04-ebfa-4f89-b1c5-7f28b88fa96d.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 0x705e417769511f634181a0078ed5297c56504be6b8347b5fe6288d5c3a5f1a0d. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZDA72436430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15ded3639604e5102805e15b0d2b27cb1e4eaadbe6799ef88bb7279d8afb904. 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/QZMEQ2449616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379bc2a33db174b14ea2d9ea861957ca5d7cb4006064bd6f12bcec60b0a22dd0. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZTB62412524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda0deeaa35222e75cd8fc395c10de555c8ec208ad1ef832ee62af4405565609. 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/QZTB62412525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f366884154b1e0ecd541d02f536f3f294402cca0efa03e9c991815f8b0b42a2. 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/QZTB62412526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e58b272d33ecb8d951b163dffc500f81090088609c476eb4577780596569dc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWW2448161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb208f62ecab2a15be9ce4f796a0b8176127ae261c20c4dc5399263fb5adb2b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTB62412527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03ff72700d1333622c3cab62d11e3986698030979ac1ba1efd5a04cee1627c1. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZTB62412528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3fee0c8e8b8650dfb227de83ffa81988200a7f00689468bed28d038b677f2b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZTB62412529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5a4cad60b357d20a62a72ad88332044ce9fa6dfb802557dea6cfe0fa2c5d43. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZTB62412530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a12e8163a2896e0662a567ebfefe136a7f71888d498946becde6370723f2002. 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/QZTB62412531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77261fc721d78a290a5f99350022ef300d8f0399e9e9bc884102f8979e7e4a16. 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/QZTB62412532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b7d54041d8deaddca9dd4b5f04715d83d5512e95a62ebec26f5bd3931eb52e. 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/QZTB62412533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5f9512d6f7e6d065514c94c3e4173362f2976426e6a56c3099f2951d84e5cd. 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/QZTB62412534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc66ea4a0a6ee7d0cd5251e6c187061b5273c1d6ec2a190d7d7bf4792a31f83f8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB62412535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100d4d6136b59d52f994c7af5b90c8519853914a99f2258d6c2cb041ba561600. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB62412536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2d1d7322be5d80d9716866ab54eebbcb2b5dc2664d3174a8e5eab6e375f59c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNWQ2443403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1ae7b65210b9591c592a14618be9e565add57e2cd51e941df81045dc7500d9. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZWFH2457463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf309693c03ce292f35bcc4bbb1ad59e6a0e6669ed68140cec66602bef72b1130. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZWFV2468140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bb2e9e95b27c0d612f0f2361b3ffd8694695b83843cf4706bf095d5db13def. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/QZZ7V2573356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4fd1f91f7219fd0209f0423b91eec2cba0279e02f9bbcffa307c83d16de967. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QZZ7V2573357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b83b31dd14d32ed27f5a8c5a836c4a80db7aceda883d00c565852d4c40812e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYZ2450416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf2442aba4dac727fbead713c716a96e52888563318f51b3d860e3e400d7ae4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAW2455232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e2acd8bb14af287dbba088ae75956e2cc5e15b24c99995534a6c39626902e7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB22435778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffb02d8aa6654ced16e5f1a4c3f10788be8cec83c16a112765970ccf6bf9f0e. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTB42431138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d720d394050f94de244a211c3b6c92fcde96e46d111e727c57be3aa3f7b6d9a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTAS2459675.