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 0xfc634a8af452a580e27391320a7bc45bafe36b7e54d7555bcb6b338c4aaac991. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2bf421a-ad2f-4665-bc21-23c240d60f49.json and https://artists.proofprofile.net/proofs/artist/b2bf421a-ad2f-4665-bc21-23c240d60f49.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 0x50d1ad837ef421ab7b7616531d361c09dfeb1e60d2b5c0fc0d68f2dfd20f54ca. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZPLR2519595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3b4072d535f9c116aacc0c1b0d6380098bff20ba02e0b3938a31db15a93f26. 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/QZPLR2546289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae191a9eef83daebb9261b98d513733815b48d7eedc3b817c04233d42b8e76e2. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZRP52525967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4183c1076b1daf428189d1bc6bd4bd312e23ab05fe081dd94863b56c88ced6ad. 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/QZRP52572455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a7ee3b0187247daa3bd823a43c691a5ec22cca7b708509b081bd71dcc22e0c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZRP52576887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc6fa63f8b29713a5d241c0cdc51eed8c3777295d7a2818329b85679d98f36d. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZTAS2512231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ece68621860a930a119965690fe80f8f7356b32501d235d838c26c81b4d34f8. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZTAT2504323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406fd0899e1e523fb252892e82fbd5aea885dda0fed8f8b57aa4cce7726eceb4. 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/QZTB52528989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb207fd6026f2dfa866db554899ae5f8792d28a47dacb7083d199d143dd9e78. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZZ7Q2532140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d9cd919ff27e2690c2ad23d64c7e3cbc57b89237d24eda6e9ed831e26bafbe. 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/QZZ7R2575308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b8c73e572d530d028d600893fe6e3017c319fc642b8460ed2955bf574c0a8e. 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/QT3F62583494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58f8bcb2bfbcd9d9c46f9467d11cd65e9907ebfde965c47655712385018287c. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QT3FD2558574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d9d5d3751d19f3463175783540eb2b46db2ea78888ff41f3cfac5fb9c1f0ed. 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/QT3FF2517119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6b8c55e38c0ec19b38e3fa4bbd8bb75b07c6139289818e2ad2b04cb115742c. 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/QT6ET2500372.