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 0x641d4710a2f61d2a57d2f6cde91372e5f13ef8b51f073d7d84dbc66c343c52a3. 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/0e8daad1-0ce7-42d7-8342-74870e9c99a0.json and https://artists.proofprofile.net/proofs/artist/0e8daad1-0ce7-42d7-8342-74870e9c99a0.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 0xb93efc42b2f1a874f57a5bf5c322ce9d9fd54769518a5eb4522faa7231fb34d2. 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/QM24S2010275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f36aef13820eccf50828703718914c025a62f5ebf4309d41225581df7a78a71. 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/QM24S2202228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a66d684c3c216bee3c13ea3991f6734d96e0ada7e36b0daf9d69ec601a4ad4c. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USANG2227566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eaefd67ab1322bdc2283068b790cbe26e2937ddd7811ede9d8b9d9d9b35eda4. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/NL1LE2303327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8979f079fc89309c30ceedd4b91a47ee8084e73ddac6071e42860dc5c18447. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBWUL2478552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469613e42538ed0efc76e800b11469dfc3f4c0fbdc79093b2cf5a836e55fd8fa. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/QZWFT2492857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8979f079fc89309c30ceedd4b91a47ee8084e73ddac6071e42860dc5c18447. 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/GBWUL2478552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb85a3ebb107d7611703578e455b9176b4b58789a9c5328426c302ac0f7e200a. 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/QZZEC2457937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d606f33b520802a70d4d859668c6fe7eb9361299cf1d930c6708c0244e55f1. 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/QZZEC2457948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7d9d607de131cb6b4bca97cde2bdb00d84d25039f92bdf03cfd9c0951a64eb. 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/QZZEB2486745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc42e3024aacd8d61c42ad296e2c97b7e383d0ea1ef2e06888dca49b086d5762. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:27:48Z), 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/QZZEC2457965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6aeaa5583e055794df00185d4eecc67aba587a1860881a989219d5837256d46. 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/QZZEC2457967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9fb90085d9f317713d8d7ebb95f6022fb3407c71b97740c507ed35f8698807. 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/QZZEC2457969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066878432c102b6df2609f385c48cf2d825829563c5858de97ea62d37609df94. 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/NL1LE2202584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7367d3b5f36c64d7a5330ff183b40494bfcdffa58c048fdb245bae0509fa8ebc. 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/NL1LE2102316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66812f95268b864ea1486992e1ae17530dcd42f7ece7a01f21a25b45130336b3. 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/NL1LE2102196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f2fcd84a33cedb634f41bc06e16ccd27a91b85cec7795cce5a621f37a4fc3e. 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/QZDA42257051.