thumb|right|200px|14th-century wall painting depicting Gero in the church he founded at Gernrode Gero I ( 900 – 20 May 965), sometimes called the Great (),Thompson, 486. Also see Lexikon des Mittelal
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 0x7daacd672175fe0ebfea600a7963105e5a0a866308fc7e79a809a11259962b36. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6f88a79-2c2c-4e19-a949-92e6bd7a7f6a.json and https://artists.proofprofile.net/proofs/artist/f6f88a79-2c2c-4e19-a949-92e6bd7a7f6a.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 0xe0cb28a9bcfab65d2ab34e1f77cdfc1f0305cf60d64b900d53bdc23abdb5157c. 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/DEZC62435499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc737df47495bf8bfefff381bbdf60f873a41a86252a806696f5c8ddd3b925ed7. 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/DEZC62417809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc737df47495bf8bfefff381bbdf60f873a41a86252a806696f5c8ddd3b925ed7. 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/DEZC62417809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac5d3c0f9102e7590be94cd014409b3cdb48ce71aae6dd9e8eea8f0f2219b48. 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/QZWFM2331936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e95cd0516b5ffc457b5ac9883cbfc5ce200f0100170fd4281419060f06c672. 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/QZTB22375154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd686428acebff7aaf5b1386ef9c052804a2a787752a34e7df3a5c92917a6553. 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/QZNWQ2309339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241190d5e63f8c7f6c42dc298a9efe23fb0a36f7a3a5477c0e37f23e75199229. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QZDA42377446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d1cbe385e5a2f106f2390ed0f7e76d753e4cf1d6912ce3219952df1128aac0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTAX2210291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e546b7220dda3a7e698403f38c8eac6754e33e13a036a39929683688797055. 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/QZHN92210110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00126105e3e4a88db0a4cf72876e5df97a1c326bf23ba7986a82e0792b7c9b58. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZES52212332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38d81e0bc150f16da2555f2a3ddfea3f0f2d721c8ecf44e740523e5566260e3. 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/QZES52212333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6805a033f5b0c00c9512c088bd5e3405aa6fb9b2fe289103ad275a5254dbd17c. 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/QZES52211087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9fe08d3f7ab4035a22026b11b9b45dea4dfbc7b9c09333cf03f73e1ee0f6b1a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZES52212334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b79ce654147cb9514dc587e54236c778b0cdb66b0cd7cc9efa80933a55a887. 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/QZES52212335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6805a033f5b0c00c9512c088bd5e3405aa6fb9b2fe289103ad275a5254dbd17c. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QZES52211087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaae4d99a410e630dbcaf13aebf7c3038f4357a51f212241ceee6eff85e8530a. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZTAT2103280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f096602f2cc1cc0f368a1622b735f277fcbdbfe91e0559781bd6a9c71988c0. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZDA52169309.