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 0x4acb27fbc32b6194753e0b31dfb85088c5758b73102d6a538bea35e6a93605fb. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4f88fdb-20c1-4c90-836d-41dc6664fb14.json and https://artists.proofprofile.net/proofs/artist/a4f88fdb-20c1-4c90-836d-41dc6664fb14.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 0x568a7c6d4c527a436de8a56b52614207fbe21d4657e7faf0fb0e0d76f87b63c2. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZPLS2314050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad334e30c47d6e64e8c83a227bb41ee3431beb5eacffb9233690a7dcfb41cff. 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/QZPLS2314059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799712fe86251f7a2b82775f03ef733be3184f179ff23c961bc2eb9374575c05. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCADY1805678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24c89869db5c18694aa7b441d35d3ce883f4eeb43c861ecd6227adf939b5cb2. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAEI1949811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b4b7e0383f3a8a87781fed6dfab926076107315398e05caf00e233764d7e7b. 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/QZTAU2110393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c4e0a6c1e2d988fda6eb62b04fc46961ae4e18756d7c36ab2458157b092d68. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZTAU2110394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eff7471eec4c4d79fabcc959e74d6818f94073dfc22d2a8462086d9d75b3aa3. 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/QZTAU2110395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6812779a7ce3fd42c8c50159f802dbbe365852b6ac70defdc4dd26244faa5d. 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/QZTAU2110396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad09bd810e983227962ad9adc0138076e69bda90ef3a18c3744dfc821641b6eb. 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/QZTAU2110397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a429ee54d0cf3b7b92afdc6ec76fd351634924b3b78b5129a771bb0b6087c80. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZTAU2110398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc814f8fb38ba690ad49693d643d35b90d8b8f45db00e8cf37768ebc7cf04645a. 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/QZTAU2110399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac19eca2eda8cefc0953c3ca92e29377853d9e5254fbe8b77b323af15971dd76. 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/QZTAU2110400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dd09d8e7ad1180bf4ab131f9ee4f5ca79e4f982a38d1a0240f7a58c9b162d4. 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/QZTAU2110401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cff91e07a20e1f1af2e0c99fc02b0ed67d0cc7c31bf41848ef098ba4798f553. 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/QZTAU2110402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba416d1e7b4bd7abbd9836383e825d7f3a1bc5366625ea4949d88ccb4ca3585. 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/QZTAU2110403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7bb42984f5c65d25f31e0cd6ceb8ec92ba5fc465833315dd68c57a5cc8bbd2. 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/QZTAU2110404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3723d55ec7cd232b9b1b460b5c7e5579088d3cf89f57eccc252b04f442aa2b1a. 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/QZTAU2110405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e14e3a7f3fd539d841b15a71afc1b0a7ab2f553d8be75936a71a440659f784. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/QZTAU2110406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1670748fc41b4e188f0c4f140b0573aadfb9f5498af084188bcf5dc93a109f5a. 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/QZTAU2110407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01351d05afc4830b1d141d347b614e0c3ac5bedafcf0e425de4273881232dbb4. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZTAU2110408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7960bcfacf50121cd9a0cdad0098769fffb44ca9c55b7cc942feb3765dda8d0e. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNWT2569260.