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 0xbf9ff60ae3d31635f2de394d84c3e4f050508276eb7519db256c9f0cd5138a7d. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4039810-f8dd-4b70-bda0-1f07b3a5faa9.json and https://artists.proofprofile.net/proofs/artist/d4039810-f8dd-4b70-bda0-1f07b3a5faa9.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 0x71f90048c9b2443ca8008735f40f5985b112db56e57a2c9ed05f4f5ec09b9c94. 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/FR9W12364251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc624014b101a6449e48a32926c6f5e3e05d2776789e576b071db02a00fa00f79. 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/FR9W12364252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c82b96f20c6c13e52edecd1102b2983cd567312e6b0d87e6f23bd8832f981e8. 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/FR9W12364253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3ae8cac325c7e31b6fbb4d975daa271d52d5173d4497e4e97b5a6cfe1db0f0. 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/FR9W12364254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c30d5983dc375f37d784ca715191b9f0d91e2357615f3d385e3bab51dee73b. 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/FR9W12364255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1eec352fe26043cf961ca0ab653a1c68bb66896391658bee8172c72531dc56f. 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/FR9W12364256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14812295f61bbbaf1cf4077657261e1922f5cf3b1672c6d5145d4af3a5456666. 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/FR9W12364257.
SOUFFRANCE & TONY TOXIK & CENZA & TONIO LE VAKESO (L'uzine)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324dbda2bc4a2aa5a58be720c954344305812e2e4cd79ec3506f3fe728063cd8. 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/FR9W12364258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44657df1a57b56cf73bdac07569c5c86fcb1f33806dbbd5dd8d6401c0b286dea. 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/FR9W12364259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe77e82a485fdca34343b8ef3a759cdf3ac66109590382121ab2ee024fef298. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9W12364260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6beaf2f24873b89210d80ad1ada2276752dbc07aa882c2fd5e22888c62cf616a. 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/FR9W12364261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e67c328a9ebbe3fa334bd847212ad4ad1d80852d3ecd74e5c41454871c28f4. 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/FR9W12364262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5366a32507468e88738f4767939369da08c1b4e7b81eaab37d7ee06f5c065ede. 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/FR9W12364263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef0322856125aaedb41af0bc2c0d4e22e0852368742ef920cd82fa30d83ce49. 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/FR9W12364264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4224481d29a368bb9149d4b48103942f3c58a64842922d01d37ce3d7997cfdd8. 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/FR9W12364265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4e9686b248e69f015ada9a6353c56c700e8870e84799836858502f8b986ceb. 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/FR9W12364266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c82931c60a9f3447730198904245594afccd9d7fb133c7749a10c134334c601. 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/FR9W12364267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07dc951d9d16aee5379ddbfe7acc273cefa8f0ce9c329552474e588099a1f1fb. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FR9W12364268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb90a12345c04a6f35dc2546e6bc8c7238bd57000a428123d490cfc1ce186de. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/FR9W12364269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e72cb375bed037d8130f941ee1095c3dd3130e3b2f2f65fdd35061dec546d1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR9W12364270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51dbf94047a8182a7b9c90c397f26eb6dce898dfeaaeef6387c435a6a64e70b9. 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/FR9W12364246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1dc68fc30ea03029f807344317b89799fccfa419a7c5b1a1069e498f70f9be. 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/FR9W12364247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbceec14c510a3924b895b8dbe1809ac4e4d352743701f10e716ac00cf3c15b9. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR9W12364248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0650f30c91d83d751c0f7de04370cbaca7819a7d99a0661ae03c3623abadce41. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FR9W12364249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bfaf43e81e3f1ec1e990f5fa291904fb1f5996f76fe318bafa1532161fa4da. 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/FR9W12364250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f7e39837ac1aa884e509ac3b8561200ee5f0982e7e8369560859393a2f2bc6. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/FR8GV2221870.