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 0x55361b124af29722f04c956fc58e290dd4fab885bbbcc9ec1e1bf4cc37264378. 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/ae2b1883-4f90-4f79-b832-4a32802f6ba1.json and https://artists.proofprofile.net/proofs/artist/ae2b1883-4f90-4f79-b832-4a32802f6ba1.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 0x2cf6c2864cee150f2f30f35df0ec682659addec831485650c4fa7a52fc1343bd. 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/PLH511200259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacb4b4dcff235c03bf2177e70f1678ad8d885dce44ff44fa3e42d9ad10f4132. 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/PLH511200017.
Zachodni Wiatr Wieje (prod. White House)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3adfe6060856870cf9c72b3a822732a6ce7cf987b7c0fafb78d89d45ed1a2c49. 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/PLH511200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d8afc34735fb445b7d22f2c7d737aca09afd84dc1d9c52a3bf2de1606457d0. 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/PLH511200025.
Towarzystwo Ludzi Prostych (prod. Donatan, skrecze: DJ Kostek)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbe80813e3f21071f9990f339f3bbcd3045d5f641d48987a094271876cb009c. 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/PLH511200663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbe80813e3f21071f9990f339f3bbcd3045d5f641d48987a094271876cb009c. 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/PLH511200663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8fbf9161c7110114d2f6ec62479ddb88a795051b71a01fd2b91cf86c37e794. 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/PLH511200666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d07d42db4372fb32393cdaa3ebec901ab8028b3c70061cd70e9b5ee047f605. 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/PLH511200647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd902d83624f1f70bda86ee126bd6e7b83ee1617cda5f4cea0d3184eb8148c0c. 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/PLH511200650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674cf011e95e87015b6289c84a6069fdbd50c7f4042268289c11a9743951a9ef. 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/PLH511200652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd5a64e8bd8f61b28df22e15c086f302e9b0f420c42194045cb31e758204988. 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/PLH511200258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad26dd3859fb554312ee9e20201d9b25949b36c0c6a65aa4a42df1f0b1a1f2a. 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/PLH511200265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d700ebf4d41c0580fc104468be55cd2ffbaee157518da53c5b2bdd69fdcf7e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLH511200266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137f5ca922fcd72bc1e9782e6354ff57b6e547d3f2d89a5b5a56c4a9dfc48d81. 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/PLH511200270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfdb5b37cab31c8aaab7ffbce6a17fa99e3b0c0ffccfaf3675d0dfc511e1f06c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/PL63I2000017.