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 0x7cb9c8b10041a27c259aa32a996b6571b9d90be454a7ede5d4be8a7b577790f4. 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/919c65f7-2f3f-4c23-bb69-6a8538536fc5.json and https://artists.proofprofile.net/proofs/artist/919c65f7-2f3f-4c23-bb69-6a8538536fc5.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 0xb1d85362b2a96b5f726b74475fdd3d1e276bb9f90af89bdf65efbd9d28cf26ba. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TWAE31700540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1707126a0269af809b436912019ad7c1a75883ed4922ae4f67433e8e940cefd8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TWAE31700541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a3e2d4eccc7797266646976da7ce486931b597e49757343bb0610662e90007. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TWAE31700542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdfcf2ee396d3999d19f7f56cdd707417432395d7f0ca70d37a4d679818ca996. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/TWAE31700543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78010d130efba9f8feb57829f7de97b630bab7370dda551277d19b1391098be2. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/TWAE31700544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a80425e377126419b5649a0a0bd7df68684496b701c5e8e1c6c4ac2c959e79. 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/TWAE31700545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7aa05c4ec067f679516df86fd830262a5fc70c0cf2af74302b1c11587bd912. 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/TWAE31700546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a396277e2ebef82ac3aefe272a98107c96384735b2bd6c8dede4998add22d6. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TWAE31700547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197e3e485ecba35bc27703d68299a395713ebcfaa738768e6914b3487f935d2d. 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/TWAE31700548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68255107590ebafa3343b7a05015ef959de9a36aef761f43d9a4d251ee0a861. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TWDX11800029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0674dfb2e271a92e20637edbb52ec5bf2338b8f904aa92d27513996d1e1ce14. 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/TWDX11800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd164f2c46e90a13a897e563eb99105fd3aeb1e4a325137553cf907e2afdd4b5e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TWU712304252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690860a0020a34fc36c480abaa3b73dc47ec4e9c50fbd5eb6ac27d7b1f847fca. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TWU712304253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd97571a436ccfb2c655f749478feb972357b4ad78606146f4cf6c941374519. 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/TWU712304254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57054f778ffcf78d07ce6c34a33fdabd06aa6bfdbd53bd806bcef07cfadd8e72. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/TWU712304255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9104aeaee846481123553cb9cc71248a1baf5fc1d630d64233bbc7c7e4253cd. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/TWU712304257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a04acd8cbeb5c0908db304a595f987e97ec3ee18c4d1786e3455c168e8f7cb4. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TWU712304258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0537f2af366eefb80514760f6c564d24ce2ef958d6adbfcef2475b94e488e13. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWU712304259.