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 0xbffb8dca2676494a26a7664058387ddf0e77d4937fbbfbf5df3f9307f1e21c00. 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/e2b0ce17-fa94-4718-9ea0-d701300b0eb5.json and https://artists.proofprofile.net/proofs/artist/e2b0ce17-fa94-4718-9ea0-d701300b0eb5.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 0x382853c3259f459681ba1dfbb4011db246a405a58814d1dd18450cd5b422888c. 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/FR2X41993936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe208e60b54174f9561bf60793bdaef40cafc0e3d8835a4df4ae617bfa8de1c43. 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/FR2X41993939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1912185ba7a362407ff0b56cc44ad24b8fd5c2717aa33b8208d5c7d419de72dc. 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/FR2X41993940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821ca82040291c78fd306125e43db2b086888194d429879cc3789748bff7e0ab. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/FR2X41993945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44110d41dd3b74d754a75f200f26b944adc07cc6da34f4078e1af21582d72f16. 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/FR2X41999505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159d10bbc14704b59ffccbe9d2d7a79d23e4c49d5545a5cf64f69bb039914ffa. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/FR59R2064063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026bef42f52249bd4f15d832c7255cd7e8522300ef2fb554ee602d2b6ed9636a. 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/FR2X41994987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1efd1be21f32265a0adf7222728ee2cac4d530c982c3793348d6dd89e50bfa. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/FR2X41999483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb538893a91e49c6dc3b8a46b39e14da94272d4d759ac4b73edb6ad62138f6f8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR2X41999484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edf934ab78a069b9e2c5c957e89e23af4ec012d2963ed92696f553f57e665b5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR2X41999486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67e940391b9fb5d2fa87b1870da01aa2a961bc8ab95f66cf35dc5b95415b2ca. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR2X41999487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe79a2a86e18ccf6c79964cd8e2978b3bfc149c9fd6d2f4f4d503ae35a349d0b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR2X41999489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c2a53b2fb24bb0f28b9b860cff2880a66985fa4d1f1dd5e087e860bddefed1. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/FR2X41999491.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7f7dc1869123ec4e46e48f643881a7fd4bfb492c9a9908190b7210e9f54579. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/FR26V2003915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd3f76e26046b39157beaf3dc2e3fb5bfde76f7a42a23d3f86c235360ebf105. 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/FR26V2003922.