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 0x0c5f32ba7b40effbfe6a5c7b9433778c70a01ae9f5df9ed58ae2606cb4f84ce7. 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/392ca8ef-e74a-4723-941d-6ffb0571ae68.json and https://artists.proofprofile.net/proofs/artist/392ca8ef-e74a-4723-941d-6ffb0571ae68.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 0x767038249435d74c19bdeb5672db89b987d19dc6b44d413e2c9e0ae0a4a76ada. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAGR2244754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdb3d60d06bd602f0559cb048f70220dbad162ae97b9d8b0287d106411f2d8b. 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/TCAGZ2379838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255f1c48f8f366279d79ba3c2366085a2bbfd9d9c1c7a30d6b3dd807b9846d5d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/TCAHF2343987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a874bf47be358701867153b705c0a0078446cba1f46fef895221e258bc1d7d2. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAHN2332783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6757a839efbf202f96131e3518e47fd9b4aa61001233eded778c114626d4c674. 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/TCAHN2383843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e822d1627b844e8f808a5acadcb45d9df1530e5fb2d28ced412aad6f97ed5a5. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAHP2333560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5802ae1aa56b9592777b0c38e77e71f55dab0ec50a9f7d0df0ca39fe88d63dc8. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/TCAHP2341914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57b2688dc2e38abedfb9a9bb784e92352531410e8bcdac8a7fffb9b9697afa7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAHR2328894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5208adeb57fb6dbd21410d862402f9d961b7eb91bd7d84c057679cabb816c9bf. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/TCAHS2314536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20bb015bd965abd999cfc5553ed79877e33b945e4f235412fc63c7709706217. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAIC2491403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa731ee06fccc0c10f8f6f63b537ed33248e41faf301a8428629ec51f070282e2. 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/TCAIU2415914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fee2fa3a38c15d13c1a37f5d9456ad37c42c75e20cfed6ba76a4872d7b4c44. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TCAJB2488418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3666f883d4524ff66c2f2f59a457e6a9a45579788ac0de14213fcd585520b3. 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/TCAJH2562077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8ece11697c5cb5fd48834b1b33e2ae000b00f294d471092c3c788ab2a59f36. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TCAJM2521118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572e945b19db6044f48455c9b8d2a21b83039c060f637382be3b375b7cb012dc. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/TCAJX2518555.