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 0xd6cd99c15280c444d70519a6ce0a9acd64f1833fac12ff60d83b0db035c45000. 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/8fe9f4f0-bb1c-44e8-b1a2-1e6cc44fb6bc.json and https://artists.proofprofile.net/proofs/artist/8fe9f4f0-bb1c-44e8-b1a2-1e6cc44fb6bc.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 0x64f0629868a7b22487aa3c68cda4dcee9bd59d456702acc8393cb46e8ba20ba0. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZTAU2487156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ca8b811e550cdf87908367452dae051b19c2e3a5a147fadf5f4be2d3af8df5. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZWFK2465165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764aac85c2d20db7082fdfebc7ceb8c4ccc802d8a1cc94fa3948dccdfc6d8ed1. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZWFK2465159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842668e4d0275d4b196494d674655bc9507e1c1132ca92229e279e8f02f2f0a9. 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/QZWFK2465160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6524b69ce6cab41e9bcbf8ad5c4223ef699935075da5e189680951202ceea25. 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/QZWFK2465161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f37ea63761a96f5b7823b7eb68db300c99b9e6860248289351a37e7c487483. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZWFK2465163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81b88c979fcbf181e29fec3da0f8ea8719a58cee1ca1cc5813d26e4bcc94816. 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/QZWFK2465164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4ae0f4619f01e15675c1077ce90eb90314e109f77a63829e5bea7cf70bd3cb. Chain 2 (Bitcoin): anchored in block 957730 (2026-07-12T16:41:26Z), 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/QZWFK2465166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc11fac7cc9fa74395a9f37954e2f113773dfac07c8d49dfffdb6efe4d8da326. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZWFG2456873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2067b227dbf8e1f9c0d46c61cfa9fac39febda5a5611f4da1631698ca98b2f7. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZZ792458946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bbc2ceba93e40f5979e206d2f038849de9a8c80f8cb80218784acd3413c2ea. 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/QZZ7Q2469678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b73ca404287b6fc9eef6c42f45bd1a992d236dce6e2761e7a9752e9dde8300. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZFYY2506595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2926028644fb139a993297324162bb16a31b13fc1524441a5560f197e3a17d3b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZHN32576765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2a8d807992f75ba1a292a95a4a72a123ea68511477dcde1694c8c967a27b63. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZHN32576766.