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 0xe5cc086b4731a61c0cb6f8bbbadbaa1b549d2083bbf8cdfb11cd4b3f7f64f1cc. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a01be2e9-09bd-40c9-84a3-3204483b268d.json and https://artists.proofprofile.net/proofs/artist/a01be2e9-09bd-40c9-84a3-3204483b268d.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 0x5f2696c0a6df43ccce34a89e853af2636178b829fc6ae9b73b1c8d3c77e3b77d. 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/QM6P42158958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929fd9c203f69cc8d1ba7d3fa75ce038d1a81c939ff78a5085dbcd3a61bc8534. 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/QMBZ92144938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2696c0a6df43ccce34a89e853af2636178b829fc6ae9b73b1c8d3c77e3b77d. 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/QM6P42158958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadc7a4e33acbce497761e64dca23a2ea995a63148b6865f5f9d0061b74199c2. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZK6Q2333618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929fd9c203f69cc8d1ba7d3fa75ce038d1a81c939ff78a5085dbcd3a61bc8534. 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/QMBZ92144938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338322791803185b652b9107373bb3f92a3da088950f49da6a446f8400418de7. 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/QZFYZ2218401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd901df9c354399cdd4353369ba8365d9588070778a18fecf02d7daf4728f14. 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/QZMER2289662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7450804cc11f4d1c6e4c842ca34754c6d644184574efa756045d764064a964a6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZK6Q2333620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8611107c6802bb6074734bf61a2f8e070206110e398554212da6729747484801. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZK6Q2333621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd91aedc7c4f8598ac5d556b3674c43754f7e9042a5fe3167bd46352f506606e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZK6Q2333622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656d0adddc94263d02ddae0b8552b0fb90f4e61f084be025947bf58ede0c1f58. 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/QZK6Q2333623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bc23e8e55dc268186398eb0075a8ba97f5dd7921c61b0d1d16faf1f15b202a. 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/QZK6Q2333624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbe66ff647e36265b00aa24d6098326b2cbb0b91398ab31759db540d5e903db. 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/QZK6Q2333625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abb672a3832b506d34652bd5a178de3762ddd59ea2f3519e8277220ea83825a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZK6Q2333626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe812ae11ce2ba9f819a576566f56b935d8f41d2fc785f87c926d0cf70b25d743. 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/QZK6Q2333627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68aeabef889fb870c83b33ffb344ac6ad4c688e2030a01b55800d130a7883f31. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM7282459255.