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 0x727f7d84690eceeb4e58d2a12f3ad0bfb2d5929ab1365983f359222822de0f9c. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/def009cd-b9f3-4412-ad2c-7effc20f0157.json and https://artists.proofprofile.net/proofs/artist/def009cd-b9f3-4412-ad2c-7effc20f0157.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 0xeaa736772c7959460f20e0c81acc75ece594cc9b6277d9beda449c3b4db416cf. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZZ7P2486421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0f534f4b134b607d7353ed3aa64c4341f117a6196a83d53eb6fc173619d1be. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZFYZ2549560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e175fca45af9d606e56f058d9cdbfb2b1335ccd65d63cc8ad8c2fc9a1e8366. 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/QZFZ42507721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa503efc42599244e6bf476e2eb289069f82dda161d653d4db66b2522f3b72ad. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZES92549639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d233d1a28e9f1a5c8eb9a030b661f9fd2764daf0a62fee6abb7b5c1e0094556. 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/QZK6N2562952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5400ebe56eb585cb4a09103b20e169559aa3cb00e45adb7950e0b78b5ed8ab9. 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/QZK6J2585822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aadc38f4492a3bc6788b8e0ddb811643e5c019298722a027b44c01e97bbdf1e. 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/QZMEQ2531344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf824b2a573cfb6f863a737adf381cdfe1aa258fc123ef1f28d72014bad653c. 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/QZNWZ2596049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad409e10553d9586a213e61eb9f57c8a8d63afafdf75e4f50a81791a105602be. 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/QZTAX2512487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef88a5d189389b379fa4cc4da1cb2dcdcb206311b79528f117f6fa5dd17ee01. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTBC2574559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb6e92327200c1bfd0edd1a9a61d7ce3c7042dc3039caedb954ccc6e9693ac8. 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/QZWFN2520068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a842b68be543c1cb250f369d19ee616ceac43d4d9e007128010ad8c91c424a. 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/QZWFW2551693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e848053455c2ee36f3a12ca8ec5a1d9765ac330a222688b4bf72b67cfdecae8. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QT3EY2534687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368cc8f2175d4ce2c1f89377c9857adc4621bb99ba983d4640cd384f318cef32. 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/QT6EA2517671.