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 0xde34e155556c0d7a0cb4d28c65a44f1df8eb886d6b48f63bea2f996ed0194e3e. 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/f9408255-e29d-4eb3-8ad2-14ad864b54e4.json and https://artists.proofprofile.net/proofs/artist/f9408255-e29d-4eb3-8ad2-14ad864b54e4.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 0x2434f3e759b0e9bc8c954dbbb846c7701a377e7d3a3b3184a38fefb2c84b56db. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BK2NP2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d976b60ae40b39cd458cde4ba78387280508ad9c06e00702531013763af8247. 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/BK2NP2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d73229494d75084e3b8a2437e7be35732991a86c476a2b19b0d0c0f9661786a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BK2NP2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8e57f1b94b6678600085eb42a46f73e5761e811c11380f1c7dccb822988058. 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/BK2NP2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa22981574444acab82d247dcc2d91bc6bce5a61f9038fd53ddd24e9d392008. 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/BK2NP2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51aae3167f24ff3b3eadb56655af4465c0b29d411ec0786408277bef28562b9b. 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/BK2NP2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501e91e07b1040bb4a39d0ae787f8f817a26f1ff87a48a266b602b8b22707b32. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BK2NP2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68bd6eaaedce0f5188da3291722edae1dcbe45c4b5a1a1593500773d97398544. 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/BX3SG2400062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe61f4aff15d1ad907ba5f053387f92a03ada2058b949e29eb8f41160379d6fb. 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/BX3SG2300325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e98c3b67bb9f4351d34c8e38c1396a2b56177e9d95427bda5f2ac6f267a4c69. 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/BX3SG2300245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8520d1f16238ce1d86f260a94cff169b07b4c923d2073f0403c3a1df9c3c75f1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BX3SG2300291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf170d44cbb7c79cea3906ee83994d7cbad3c959ef45baa7da0779933a7b7f27f. 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/BX3SG2300246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4c934484e6aaed8d823860eda12c0cc44cce5e0fe20330c81abd39fdeeb521. 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/BX3SG2300106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ce9c3d43194f969b9aad79dffd0ddf1f0190847371114f0151e86181181523. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZGLS2331070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c11231e9489d3c1bff2d23a17aa023e3fe9534079b4f3ef70f868c7e1c65bba. 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/BK2NP2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88353a2332740699576f2b505e0e3f338cdd462ccc5ce78c24d460a78f2f3a9d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BK1NP2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2ea0573d69eadb3d954a537bc52be087cae49a55acf221567c735f6f78672e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:02:03Z), 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/BK1NP2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1241501472cadea8e61dcba09dcedc5063b8601acf9c92ebfab38f0851bc6421. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BK2NP2400272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ca1df0cdffefc895dd420b380929c73ac0ddb2ab74e6a0f723fb54fb99c05b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BK2NP2400274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf729cedd6d545e827faf7d2e70a90206f3f8cda24a109073b190337bc9d2ccc. 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/BK1NP2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fda5b168b37ff329e94a0a547de45b41a69eb6cf3425b74be584e40e6d2bc8e. 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/BK2NP2400146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57d9aa7b407f421f5db80998c0ca9e09dd15bb67fe3d9ae7ed7a98627b50249. 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/BK2NP2400140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfbde9744b26c098ce9150a9d9e4eec985c65ac9484656f3be674118b8f580e. 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/BK2NP2400145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff91b5534beb8ae9e37945514360dad5378c9b5351fc77ebaff5d5993730c2e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BK2NP2400096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6415e23a854a9abebf231187a05c1847901766f34dfc06aaf6ab02170c4fd4. 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/BK2NP2500008.