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 0x8f64c5c7c052f3520c30868b21dc54bfe32fbb3ff655d76faa2472746cc5f6e8. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/87caf3be-39ea-4f81-8851-8676e04306b3.json and https://artists.proofprofile.net/proofs/artist/87caf3be-39ea-4f81-8851-8676e04306b3.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 0x9b44a87ee99c9cefedc76da20b56ae4aeda12d52fbaf50311271b09e186b6ee0. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZNWS2326457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e36bc9449efaf361c26f76343a9615cecb245c88a830ecfbebb9ba3da9b545a. 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/QZNWU2308614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b88685742b89ceb86f16630d7ae9d6b8754bf2f6235a1d7872bc1c2aed4f2d. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZNWU2308615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a78fc5828e91f2d07bfa035777886e7352840876887f2f533ed4278373e762. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZNWU2308616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b856341ab7e2b5752a68e282c7e3497ba85c6c4f43fc0862af5bc68cb2af6f0. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZK6K2342985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d56f4de18692ac4831534e4f8adefd7befc7d162449042a7975d302addfb3b. 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/QZNWU2308617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b44a87ee99c9cefedc76da20b56ae4aeda12d52fbaf50311271b09e186b6ee0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWS2326457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b856341ab7e2b5752a68e282c7e3497ba85c6c4f43fc0862af5bc68cb2af6f0. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QZK6K2342985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089b98eb2a0e189b1589465a5d06e94a03821ae420d3558201adada7cc9ee733. 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/QZNWX2475187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fca55f6184b5406a08004395979d1688a923e85f3637674a7a9946dad10d0b. 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/QZHN42441271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc658643d4547cc190f107d6b8de5caa647f0e738e9429414aeb4d6618b769530. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZNWX2475188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1fb621557adcd412c5b09097f9afa7bf63e786f72bf8643df0ea8139273248. 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/QZNWX2475189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672e62227e542584da476cc52684887d3f34a333d371fbd0ba945c20038e396a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZK6F2493076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd609d575854880cbb86de36c1611cd56f219c328e6beba8816b192081f09c8. 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/QZNWX2475190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fca55f6184b5406a08004395979d1688a923e85f3637674a7a9946dad10d0b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN42441271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a49b9cf197100e6b9cb89140a955e12afb4286bb0e85f14ea357045fbb2455a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZTAZ2334474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07e566bb3783994ad894b76b79fdd2fbe5432a0d00307bbcd2d825caab87eff. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZNWZ2373323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedab6e22fb9f08297702d3a6c634d8c6bba80ca8e088280de1da6829fed54f5d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZTAX2384582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebdc127c901cb8c034a53ab1833bd826ffca2a4c5e1eabf6d1a08daf962d2660. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZTAZ2334475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d68cdfe0a26a0c088a5141b80f5fcfda5ae1e5476b122cfb8d01d7ed225dfe. 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/QZTAZ2334477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedab6e22fb9f08297702d3a6c634d8c6bba80ca8e088280de1da6829fed54f5d. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZTAX2384582.