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 0x202a627f3a46be2a47a93cac476dd5cb907fe631a0d791d4e9a6e2690f534674. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e800b79e-6d4a-4c0e-9734-a4bba8d50ed9.json and https://artists.proofprofile.net/proofs/artist/e800b79e-6d4a-4c0e-9734-a4bba8d50ed9.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 0xa46036c26863464da8549fcee982c8308f24d3391ef5dd442aff8610c5570b83. 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/ESA092314662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7ee854ec81660f21a58ab49407beaa9953a49c9bc4513bb8d65467b85c8ac8. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ESA092206412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e23b4c564ea6693776a448b756decbd9dcb71a874b854671110d2868945b84. 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/ESA012189755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da200e4b1241ee2fa665ab7342bf6eb74057e65711f20f0fe8deee62b561d9a. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZHZ62122396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadeeb3e236f4b9950d279d74afa9a078dd42d0440646a8071045a4a2c96fc5a2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ESA092302279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb04ede8024f68933740fc54a8b2f07e08447a5b31b5c298cf2359c41e8c8bd. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ESA012209187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98121b8b2c208040191cb99be89e2a2a602c52a238dffa552cbb0c9dc0246ef. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZGLM2188293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985f394cdbce0442d96e09d0aba4edaaf0abe37c0ae5ad7afd6408ade6ddd024. 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/ESA012152842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59db38232e1a51e4b4026c378d0b0f12192e827323b8cf0464e90470f3fc6d3e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ESA012209188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57654d3a52e5f8a9e0d093ca9c07589881feeeb37567b34937d95c17d50afbb5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ESA012209189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0470ec4e15ff2220d7c6a53b642da855116636aea974bdc798bb7bcbeaa9e963. 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/ESA011543339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6875afbfdc51377ea58fd9f2be14d00151b2ea9621ba70ed578fc95a69fecc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ESA011582076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd00745d66ffe0d2a505e292a7d189bd00535b0c2baf74f4c38d83d42de8c63. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/ESA012209190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc670d20cc9733f0522bf3182b229f9afeaea1cef3d1b63060551a8d3846d72f1. 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/ESA012209191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2bc84e8876195208c76319dac9e9d331f738fab0c432a8a87a168403efa4cd. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/ESA012209192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81650d53de74d3fb938665f772a30a2c3cea4876a14ff5c17b43ea3fd3c47bd. 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/QMDA62261294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35765698c8c916fc6ac80757244dc18f4332ed50d3054e6b66a163ef0144c1d0. 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/QZGLM2147692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1212a2b7870294d502bc537ce42f5271ab1b2b9fb9954336a23c9738f461a835. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZHN32453733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6c257d84a7eb48be5af4dc54f3faa0cb61abc8b7a9e8cfeb7ba1902476b17b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZHZ32117637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ec0f48e09acd840bc383c259427e0e40bb6ea175ddc9b5605019121c2f1099. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ES75E2406789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1884fadd89fa0b48de1c01015676e0d4fd1a8d879f9330b3ebcbeb31d50ad63. 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/ESA092437830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53383e5c1b0a921032a0b2ed2c3278ad835e3fdb2197b659b5ce088d40e13fe. 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/ESA092319051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab816d1c66a9d28e686226b1cff4e2b57ef0d682e97108d1255f7b5041d5366. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/ESA092307487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f4d177d24eb91fbf624aaf9a9c5251c6442cad99d40d15e4109603a2e1591d. 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/ES75E2205806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71420ee63f8052449442c8718ea3bbacb26c120c077823fcad85866d309f521f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ESA092410737.