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 0x61e50d9789d3f754e1ebccd1960e3ab8726b7a6f5090e299c7c386d93df0efc6. 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/656347a1-3c83-4c38-874d-099dc435afd8.json and https://artists.proofprofile.net/proofs/artist/656347a1-3c83-4c38-874d-099dc435afd8.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 0xefa03db34728a8df4b9be257d01784304a104202c90dcb1a6a94d86b1d111cce. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/PHBO10600779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbff52d713c41b14db83dea25cfbc4fea8d641a97e4aa42b4ca7825621527bca. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/PHBO10600780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1cb291c28fdef4891df831d33e97a960630ca0c30f669c887074bcfe9a303e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/PHBO10600781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc669047d518f1258cd98f576ae13ebff516c8a5c1377f1b4e1a09a1c7529859. 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/PHBO10801041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b068a9f19a3ce9c6a49d44ad67e61288f932f11c10ae3fce5f209d01eb31253. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/PHBO10801043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe2503f05e28b622df6b0f6232c21239f188f4fbe0cab409c2cafcdad30894b. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/PHBO10801044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4db1077dea78d462e10be26284152f44e4e9d34f73452d4a8cfc68e9b7721c. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/PHBO10801045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f4c41bdc8bdcb3ecbd0fa4632e86fe612e886cb0f9f548fcafcd66249e8c07. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/PHBO10801046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1407c78dc0dddd845cb8bbc740c9564e9978fdb4b3967e3227a73a0c593df7. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/PHBO10801047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7dced53507de03babb937b989a74ae3ece54e0671a2646d21c7eaf069a59d4c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/PHBO10801048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04b5f6b1ff605e82d3d638e2ee7d16567e52b7bd286427525bfc4c6bb22f42b. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/PHBO10801051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9344dd010335459e7a377e50c9526ed93f16d691d54717aba8e73cda0f37883. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/PHBO10801052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cfb3e84807b2b00e8faad10fb0273a8e2b4e811543f50062c81622c66269bf. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/PHBO10801053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043a3411c81817d94e4dd625938894b6c4b9396df7961a0dd5b3299c6db02c4e. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/PHS110900032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755b99a2cec7523a0573d2d049fa1dd646bae4561351ec3fdaa4e0a54dce8c62. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/PHS110900039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33765f1641bda3b8f5fa6ed4feb270f37747e60bfd9db97b425118ed1930adb7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/PHS110900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fa4ea67b63b35a00753d2d574488b3441da5494e78bb1ec2d19b904a288ae1. 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/PHS110900042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540d762cff2e718b85eae327cc3398fd1220cf398fc8f95c6a78d571ba73a2f8. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/PHU011212526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e51c010312d20bbe09b67c9e7e75da83f96e608a5706ee3803c0f87c27cd8f5. 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/PHU011212648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64dfb18fa74adae1ca6fd29374859e9f546f9088d2958ad38e80a498c517a014. 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/PHU011212650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b22e71e9a733f81de3fd0ae287fed2857217beb3497b768c74b4ecfb2b098eb. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/PHU011212652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b85727f21c3040349ca0a6d26533c24b5d84016fae4b55ae0e0ad9b4d8955f. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/PHU011515048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8865f74b738bbfdab49a696242416d1bcc61379a22131c7aa870b013aad797d0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/PHU011515050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd562fc56318d21b6ab1369c77e64a46b617995f4ec59862f8597d897225ea6b6. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/PHU011515051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5494ca47e81f461eff495eba28f11a0023df6fa6e4b4d47e6680767f9acf69b. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/PHU011515053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998962da5eeca357d2d5fd5a10ba9220e0a86b7794701688f7c1258b5c862ce6. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FRX281717821.