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 0x63d116e5daee454a15b944d5b71c993f141323653c2b7f181bd9a9a063ad3b4a. 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/3caf6540-8a52-4ca4-90df-3d3a9e914ed1.json and https://artists.proofprofile.net/proofs/artist/3caf6540-8a52-4ca4-90df-3d3a9e914ed1.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 0x84197cc294c7bbab0e92c1e267cac1a6a3f6cd3b53e75b89cc89edd1777808c7. 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/ES71G2412255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7467f8897f0155c730159861499e05594974b8e7d2571d516a8678cf1aa77565. 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/USA2P2450877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e9ee33791b7a094a20f80cd3c00974216ab591824f2579e788b2040c988ad5. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:05:23Z), 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/QZES52452079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1333a49fd42d32a4bf894746bc89ea43bee9a1f88a36b42a67efe3c9c80ab1c8. 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/USA2P2353967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c99263a3ae67c08f1d1b99f26d33bf0babf21af21a917f76359453f540fcca2. 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/USA2P2345712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b40bc4a07d45a009a103791580aabbcf35d256e5692632c931d91944b937c2d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USA2P2340162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc6ebf27d23ed146fc886520a8116fcaded4437bed08544f52020422c496714. 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/QZHN92490811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ddd0192a7e87b2a70aeffffd3405ccfa96ed24c23b042fc5271e6c6fe1f464. 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/USA2P2325685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e575896242b4bbe9503bda6a371cafea950cdf7e7217b68c1e6430e93ddebe0. 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/ES64E2419158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07115908c4822c1f62a7e2da3fc17f9c1a78c2dcf683e73dc61cc45d48242594. 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/ES64E2461027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f12a8967ae1780f336671a82b31dc92907ad87980680e664a27a9c97e07de6b. 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/ES64E2448630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf557a258a432c7778eab8ac0d4c9caf8a7765ccae2267c2c3ad22bbe08dd5de2. 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/ES64E2332355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2952b4d43cc387cf698c1e191dea1db5e6d70bccc9b34fe0c94a7c3522e73a70. 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/ES64E2315441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a39648d770303c9b8357b9a053d7b0de4ab4f2a47cbab40e2a443c34e239b75. 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/USA2P2340544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf405e1927009a40e4d7636c70c2c7c1838a2c18a84d20bd01683ff4753b67e88. 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/USA2P2328605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb38272e801f1585e0a2f3e3a0f9ae6fe7e925044c4813a2a0d49e79c69512e6. 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/USA2P2319771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f031686cc020d347a88f605d05085dd41284b535ab918082c914867b8fe1c00. 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/QZW9L2441416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8d06170950cf26e68281a5bca28357b089b9546a7a264c9ce33c5c33bf7bd0. 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/QZW9L2441417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd181f40a22708d26e7aa6d0c58170c9df4f78afc3c93a13350d4d4ce1a2f149a. 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/QZW9K2495085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b6ba5b843c4fae946c09f7c6c3685ef2b963c8b348a37f30baeefa4875cafb. 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/QZW9L2441418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4413e81ad5fb11da2bc47c8168f434b2da234fd68e069cb4e9b06e7c637ae4b0. 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/QZW9L2441419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3a0b37011f9f68d7b708cde8065eff309b166be0212b1f118e9aa9ac19d1f4. 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/QZW9L2441420.