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 0xa28a2fdd2c18d15a45367e08d63546ba60dcc98dac513a44829547332813c108. 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/6583242a-f996-42fa-8052-11ef2b5ee144.json and https://artists.proofprofile.net/proofs/artist/6583242a-f996-42fa-8052-11ef2b5ee144.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 0x680410b58ef360b132419094854d34e5b890d54263b6d5a8d19d85dc7c2e6b83. 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/QZFZ72127955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e031d23174523e1004726e05c7777a721c40d4cae44ffe97fe3810bcaa7651. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZFZ72127957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7530cbc636680c67892623dbaf20601f1579c9ac5a7e114f9f108e13a4ff1e26. 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/QZFZ72127960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5162e85cb12a54ec40d086f1327b3ca0641c727c9162ce6e7bfa67bea25aff. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/AUGBT2417431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9016ec5c5f0a8bc863b776afa2fa23b148890b2a2058c21c30912cd53faf02fd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AUMEV2476405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3669b550d80aae4f5b2f9db5b7e962b064430a74f31c3a5b683339d57fa5b71a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/AUMEV2451550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4831048592686f08831e7327dd7bfa74e50918b86c4bdeaddae5e117c025c88. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFZ22357516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f4c736a9f520648a8929c4e784e888d2a658f29fd7b49e7d6403c1ab42d896. 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/QZS7J2227022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c707ca596f63c9d0ad84679e621fece49e7830d359c49b448c132e5c08a1bab. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZRP42243831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b2274247ba0fb11d0e1cf6f68c6ce8c6bb13bf365d06b41c1e29add8a2a242. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZHN62254359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02f9776d409346b92b90b21bbc6bb09c780642e7b5a26c5652d2fd9f1792a66. 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/QZFZ42268084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50424fba5b4db9e99a974ec1f17e7038d171cfab17b65e36adba1c0f0d736342. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZPLR2190937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0699bc5fd229c2b40d61d23a76c26428f1c70937389ed3f1fbe0d86e7a170ab2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWT2193245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994b9848f9c2a8eeb623f61c1f0a2126dcaadc4d8bf8a140cb31c0628e203156. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZK6K2187247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3cc06492156f790bcedee96bc2f18ffe7f5fdc449e55c89f746d4d48e32c9d. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZES82166562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecbad0ce840ce22fa3658c68ba370853592d6dc281e5a29bf47b336ed1b538a. 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/QZES72061209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140160136abc5936ed9cc7da5e7475386c807b3164f7910b4508f9db6e51833b. 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/QZFYY2093872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be620f5d76d22817682c8a642c3433d73ab3f45d6c42401bf25ee394aa4a3fc. 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/QZFYZ2004793.