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 0xf27a73519a01303a3ef56f0d7db7f93109029c1f15b43b9e04783dbb9245f5fc. 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/0fe5580f-08a8-4299-aca4-8bc93223ac6e.json and https://artists.proofprofile.net/proofs/artist/0fe5580f-08a8-4299-aca4-8bc93223ac6e.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 0x3e33fe0c892dafcc731d25868a5310dbf7580f93bd72b641d7c4bcd4224ecfc7. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GBKQU2043743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e7de43cdf1d763070031ff4b3a4f06938aa3224306ba0f2ee3dbc0b959122e. 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/NLFL72100310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45205e12f90220c55febc5ec3c47e3d8b65c60a47391e52a9c4f4d0801584e52. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/NLFL72100311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4bf22f9387dcf265cb68dab39fa4c8b9ff233357f108f055b327d6ba1320ee. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLFL72101084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebe561170500831d287db1fe5ccc05bb52cd44d95908315de762d55f61b3702. 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/NLFL72101085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3c0cb351cb109f4d6e801a65a8464211eca3947053055a3d1f45cdc290605b. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLFL72101086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df60a41542f9551e46ccb7025f1408c188d2308f4c6b7c00eb39fd29429c820. 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/NLFL72101087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711ac936f7e8c0834ca1995ac3ceb73246ec68667be0d4db3a6876ec75393a4f. 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/NLFL72101088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05788dfaec359b99bbc07095189f9fccf110f0b70436def347abb92ee52b94a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLFL72101089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d5720af4c0b247bdfc38f8e47f38dd44ae651caa31e6680adb2ae4aea9d757. 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/NLFL72101090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8de09a846ffb3ab11ab256e1a5afb656a6973ee96336cbb0e15547afcd7a40. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/NLFL72101091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8c1661e75536bc9c4f4714b5c0e18cfd54a1e744b18b0aedbbe7db86cc66a6. 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/NLFL72101092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27174c6ebfb61748c4780e125d36dc6ff2a55dd59555f2306667b6e4b94090ff. 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/NLFL72101093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe956d4564f9cc13c5f9a30b12f1b56059b7bf8a9f6fbbcad3bad4bfcadb6d4eb. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/NLS202300088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b166165c42a647ea90332d0e4c66677337e219f9927a4281f42cbdc56305e7. 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/NLD231801344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36ec5c6e6c0e68c4babe18b86da4e55f1ac5b6f9ca6f53725d6452c4ded0930. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/NLS241900278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8b51506b3d4cb3f20c220c3772ac2c51e023466cd52dfd7cf9625394674236. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLFL71800052.