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 0xeac526248ec766e276d409ed5cf5256eaf40994bf281b2a38db0f1e9f200c2ee. 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/691f92f6-8539-40f4-bcba-8c92c1077f94.json and https://artists.proofprofile.net/proofs/artist/691f92f6-8539-40f4-bcba-8c92c1077f94.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 0xcb1c90e412b64b401caf952958ddce753efb0a78fec65d19febeef3b954da02e. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZMEQ2191504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2403b251398c21256ccfc95b235523bb42a2bdad36c35f6a808c27f681fb1814. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZMEQ2191507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b91f9d405133634ae5091b0a65e4302ac047a8ced23b710d26e0fb2b8f2ad0. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZMEQ2191508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd182fcab0d35ba94202e249a3da0191a9937c2fa51eadf1702f4113b15b18ab. 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/QZNWS2140395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a3590b5c9a181d487e2e653560029572809a0b6e443c2a652580db0dbadd1c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWR2166673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120d6a2f241e8179ecebc7fdd4ac6c699bf9eb2e3a2b887b0f571b54c0b3253b. 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/QZNWR2166674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53605141de57fe19eee50f9a35cd61e32ef8b387db6ae9d17565699dea58f25. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWR2166675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383ceee1bfd509ba508bdb9ce670e48e6ee9ab1737b966612e7a80d7db16ffd5. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZNWX2177932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17246b76b3cab82e835bf374ab56087ebb880bf8e08b4c12f9c08fe89b2d4dd5. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZNWX2177934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23cb80054d9332cfdd54e2405cf258eb8c9d54749bd04eaefe8962dfbbc6c6c. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZRP42143751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285622bcc314af649745b19c6c3d370f587e9dfaafaf4f99249a4cca2e342787. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZTAS2182390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375ed1df64ef847033243a3818db5478fceda00fc2f74ee34980acde044755ee. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAS2182391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca19229f12c0929adfb602b9c269c95a3690d8ef2ecd190eecf95e490b8ce2fd. 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/QZFZ22252654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70980c250e25d51fe162d3998f3be27962d5ea10fdbb583cdd50df654344ffa. 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/QZFZ22252655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85f889e551388010d62cf03cc59ac1968757bc8793c486b9e1a14514d4cc23a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZHN42245489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede2dc56a8889125c4d144b3a80523c4ef261c65a0da464ca7a3c765b4cc081b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DKE2N2200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3523e8f44fe244419481ccd11a9f56bdcc0a6c1cb3e71629ca08177b802d2099. 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/DKE2N2300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d679bad6611107d6632c9379da83eb5d9f4c330f0eebfa9c514a4a85c37ba8. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZTAZ2362214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b800fcd4a87a5f61d7d4fe6e7c4ebe60a1411258de8c9569f27bfb9ea87e60. 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/DKE2N2300113.