thumb|The Ass in the School – engraving after Pieter Breughel the Elder, 1556Caption: Al rijst den esele ter scholen om leeren, ist eenen esele hij en zal gheen peert weder keeren. ("Even if the Ass t
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 0xdb8c1ad7cea584dda403878b46b41e6540ad02f85cad0d88b75525f6e94ee25b. 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/253f5359-53f2-4326-952c-a0f4d5260fc0.json and https://artists.proofprofile.net/proofs/artist/253f5359-53f2-4326-952c-a0f4d5260fc0.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 0x882d6086969d18c881f39ce5488ccdb7a9d48b349968979cf5d8e83d9e667f79. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/GX8LD2491119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc42ebb1e5aa5abedada935707a3b3dd15d2262e6c70a1b5b421ca1c2d44937. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/GX8LD2489302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2443c59ed864cc4818a7420f13cdf31e060860bc4c125e2671f0a8722a9c177. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GX8LD2423332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c82c7db825810b93d6c3def625f1d2e461faf5677ffcee5423b1f132ac824d2. Chain 2 (Bitcoin): anchored in block 957527 (2026-07-11T06:08:55Z), 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/GX8LD2413332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d173c23812af2b51de27d45412d5f7d62965729873e535bbb267a6806f315a. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/SE6I31915913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd96fbe1bc103ef8cddb381b6f8c8ea5c5a809b2878214d215f3833a4b9ba9ad. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE6I31965566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c415dbe606caa7f84a1a82b2f7a0be85dbeb80d32e46972f6fac28b766ff21a. 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/SE6I31937326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3018c79e7c37408ebf3a966b12b85d5d9199702911654a4338ecf3ee4a7ca4. 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/SE6I31938032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3024a71c180e7d86fe59211d9d6f9633f046f6a4f7454af11352a1fbfc3c1cbc. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/SE6I31912699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5278bc66d414f823b32b14c78e0245440505ab109bf1ee158b41eb4e1a154de. Chain 2 (Bitcoin): anchored in block 957608 (2026-07-11T21:00:50Z), 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/SE6I31942961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f1d583bfcbd09bcb96105094bc623561a1b1cf56ddd47dd292e1e3c10dd34c. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/SE6A91958790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe214865713bf4152dd3599499f48cac9276e995cf3b84813bfbf39436b8910a9. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/SE6A91905497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028067dbe914be84ff8d33f6807504881ab8c02d6b26faa5db98586fa782e41c. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/SE6A91905278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07ad59b4d23c463d909112b366811db56f6a4740ea38bafe76aaba8bd2fe29e. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/SE6A91905336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424bce832457abce0dd28e636792fa4c05355aeb7d229c49d34e3fcc7cad1519. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SE5751955512.