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 0x0c4eab614ad547e6b01d5baa3ad3dcffd320a6c3cea45ba44d8071c5e6d657e8. 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/556488fd-4930-4472-b340-a949ba37c1b5.json and https://artists.proofprofile.net/proofs/artist/556488fd-4930-4472-b340-a949ba37c1b5.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 0x8af46a9629992ffa0035818c882a6d4785c71a70479fc4536c0d565ec428cf8a. Chain 2 (Bitcoin): anchored in block 957711 (2026-07-12T13:56:57Z), 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/QZK6J2432446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6e6a050680aa388325bd6eca0eec8ec160fd0ae018efb252ac245a6086e060. Chain 2 (Bitcoin): anchored in block 957714 (2026-07-12T14:35:57Z), 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/QZHN32542276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b00c9240ea6f0d3ab1b0d21d88d350bc100223db3116f54b396da28dbd9f6f2. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6M2522001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951ece028e6ea38f461571a598d6f4475cce98a1c704991a46f6d58a1633f8b5. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTBD2588981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa706c3c087b530effe2fb1ec6efcd0aed15812c33d3af58c1382b1fe50e660c1. 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/QZFZ72409228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd086476274536c466b8aab9551c5657873622694281a2fe71b14bb2c79ba3e5. 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/QZTB92572661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8514c1babaaad811b514e0481be9c841bc534a22bade8fae72dffced543d75f1. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZFZ62496350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6d2f7cbbc4151f2534b4cfd040eb1ddb83af25dded2abf33e71fd28fb5d980. 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/QT3EY2497193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2903ffe9b8379431d81e07ab20e4bebadcf8a905ac3594541ca34720f97ba800. 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/QT3F42536057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d767102091e80e149c552b235a7a307a2e56c14bcc31b8af3f7b0f55bc4ff74. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHNA2494767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e08a4a89c2d7187acc6728fa80d664e995658d282ed1d327bb3bce3ab6147b3. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZWFN2414376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2407be42aaa1db4c333159f255f8e20891402fcf9e52122537adeae9c3b25f. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/QZFYY2449331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e229c8ce409368607f1935262ff988776ab9c91e3c141799b065d4eb93d0b79. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZMEP2469658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702cd6abb19aecfb7fc78d5e90e1ea3f255d5e5b5da9b7da77c31bf8973e25da. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZK6G2448410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb611619e8498a3d2b7adfd1b49450efa2003cc4cd49abdc9d0bd9b3f62dbcc8f. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZWFE2499426.