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 0xc7021df7b563a49b52725efae08ff8da8f751f13f20f58c991ad642b5fe27761. 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/ccc2949d-ff9f-4552-a2f5-8927b0f8aeb0.json and https://artists.proofprofile.net/proofs/artist/ccc2949d-ff9f-4552-a2f5-8927b0f8aeb0.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 0x2773e15c6ff114e886f0a078f48963e8e661ba5f1de3f909f99a99fe845ac73b. 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/QZK6G2301633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c79350d0c299cfa40bb552cdcdefa371cb2d1a4adb9c2c1a8c7ff08299531f. 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/QZK6G2300131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7ae9ca3e7148081669b99a6346bde174b3b0c6a35eb7cfbb02f0e0530641c5. 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/QZMER2372656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0823a6124b54592c58e7c386431e29b7655997569697ec7bee06a38071512f5. 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/QZMEP2389382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5486cddd7515fa6ba638b42294e5b26b963e3c9dce1aa7e6c4377d1097b52d. 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/QZHNA2394339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2189461b6e4ef47c3332fd745974f101636861506284ed2cfb108bc8539ff81. 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/QZK6N2376004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87b8fb58aaeb14cebaacbcc9e5a3618138b59988d8d4dccdf1ff0c7844ead5f. 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/QZMER2372659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7280cabcaa510a9a34c69a759b7d0aca759a8c6827058ec2eb4cb49ecc7d0e0. 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/QZMER2372660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ffa8158b6c66239645085f5e495cf568d14c7063ba52f9ede322a495579e7b. 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/QZTB62326319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf496be0a10d9cb05eff6e73c3ec9ea24e7c32516d8da15756c418ff8c0319577. 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/QZK6J2084872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e560ec409851e4c14c1fbf02fea2123ff90de89bd5a34521a426765217508a6. 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/TCAFS2149928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdb7b9729ffa4b17c223c579cc0f3079fd4a8a8df116531e3db4006bc135e9a. 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/TCAFJ2103221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697b48a9cd702191467481e8b729892ff5fa44c6631fb27c43e2c770c9e5b8d3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFE2335372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5ab0ef1ee4a34223cc5a9a0d31fd74042b50bd90dd18c117c63536f280cc9e. 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/QZTB92338246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb64f1ec4b38cb00445318b58fef25c68ff44af528452745dbebc0cd7fb85b6b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USWL12100172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06acad0801f8990260c92cdfea55e05b4939b9ac9c5e5afea50c0e9e2217f60. 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/QM24S2404778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381d3f187a8cdc13a74550288033caee66be022a78e4e90b633c9b6f3da4992e. 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/QZTB52214125.