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 0x69dc09ff33456329ec94821004735a7c2e4c23c9b462bd3129fb9208468f16d2. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd44e037-8636-481b-a437-119a5f6e2f43.json and https://artists.proofprofile.net/proofs/artist/bd44e037-8636-481b-a437-119a5f6e2f43.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 0x143d3a3dfb3dba27f1e3f251db6ee5959836e118d2338d29ce7cf73653276402. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFM2558519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace8778fefee7f26e2765f7438142e768503998d840bd7c9baa2db745ba0578c. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZWFM2558520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd084968655a041ea29ebba6cd9b21a79a487ac556d133a6f900cd3f8407dcc3b. 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/QZWFM2558521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d6555fccd5eef4b883fcc9ad8a7587825f1e8586cda29b746a1a781973b218. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFM2558522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfd50b53dea01872cf62216f53889e7855ea40db8a27d53564c035f7f7048b1. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZWFM2558523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a8e882c6b84743f5c3d1258626f81ffa526d4f0f3a054b464a008a6c1b9ddb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFM2558524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f07c06fbbf8827af4b31ac238f4f37308ab595dab78fbce41386ebe25233fc. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZWFM2558525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716c17997f520cc3d1ed3ed8dd64bc34af22778ff34da821a03ac72f4ce10387. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZWFM2558526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0925549aab69ac0353fd64635b0a7f05848e73b375e44383deff47368ba781. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZWFM2558527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d19422d064d2d3845d13370c652bb57c23b2d594f464bc3240d6ef304c76d4c. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZWFM2558528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e52789d5a8cd8feb52c274fa676e219058ef957623c04076afbfd7bd0ce3e4. 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/QZWFM2558529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab3da2b67163095fc36be8e2b7807dc3185be43e7513fe8dccd60bc3780f09e. 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/QZWFM2558530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639ad6e099525d427d230347015d644ac9b4ebccbe0a44a16fe9ffc5bc37119c. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZWFM2558531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc747d11ae2179a629a6c133f5fe70d7258b7153ee8526da27f7530c1e0428c74. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFM2558532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1b1bf57e576e9369c7a0a2abec5a6cee9b696ba54ab4c4ccd40a8f4636c9bc. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZWFM2558533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c554d6bacd4211aeb80328542b5832a41fbaea43ce500a9f412482c27e9eb2. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZWFM2558534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cd5c03f735f9e697365f175a2f89000751412aa465e801490a63a0cc66d199. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZWFM2558535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c856479d6e1dbae68732321900c39459d9cae228a002cd2474d775e801b36c. 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/QZWFM2558536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a91778f0658c14ab9125af48950ca2119e0c58d17b7683a1ec913a9d1e8878. 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/QZWFM2558537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f600dc3e950cfc9897fa97f4d2a34bbf82786b07d74d119053c1cc6189cc14. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZWFM2558538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f13a291a2b4405660c1d2dab08f2029b0153fbb60a8cc877e9b17bc6079a79. 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/QZWFM2558539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f5e6824d2699c404a5961f2b56740818bafb7b026e911ad48ee338165072ef. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFM2558540.