Pure may refer to: Computing Pure function PureSystems, a family of computer systems introduced by IBM in 2012 Pure Software, a company founded in 1991 by Reed Hastings to support the Purify tool
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 0x74084e9a520797f2b6fc0c6257e10957bd5814ebf2ab2456744aab5ae44f714d. 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/57c94e12-d262-4abc-9b04-d7f9879adcdf.json and https://artists.proofprofile.net/proofs/artist/57c94e12-d262-4abc-9b04-d7f9879adcdf.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 0x8fbfd740ac51789ada897cf5ffa93eed88b61d59eff1520eb577982ce2aab8e5. 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/QZNWZ2488607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4579a26c0add0f259bba70024fe9b8da853705d769b2a34a25ad52a335e6a38f. 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/QZNWZ2482157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a06f53df5cc1155332bde3761875ae62fa3a17f6f5beb22fb1a4c54a2fd952e. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZTAT2418621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1f5293536453a6ae726f366afb9e6679354a8e03d49232cbfa5b1dda05f4af. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTB92437642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fff1ab1b7e97b892e8b3a4c58d76b8e2dee775aa86c4d2dbf4350b19f76c6a8. 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/QZWFK2411656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7154e60a63fdcd67ca05beef7ed3a546abeb127597ca0d4a2c1b304a25e704. 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/QZWFP2458177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f494e94a3ba216c4ed5daf47d2080031f799aee9dae1ce9acc85c529e6904a. 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/QZWFR2458865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa9da8943ecdb3d35974f0ac9d4bef4e221607d1df11ab8750d44f74930ce60. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZZ792487771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa7d204dfc0a408d106b85e9731ca5a24dc023071b96165e98ee5b4bc7911fa. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZZ7N2422427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab4e81f24e8df4a5fc1a578aaaba2b37387af370ec226329d32b9a17f673655. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZDA62552732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e3b23f992acc80ded750211a99bb1d2889d74dad88c50cc84e74b8e8d9a62b. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZK6K2565768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ad1e8311fffd06cff83d6a21b1da06134f229ba7f0839a141db676f4b9b832. 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/QZK6K2565769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c19b99915a7e4e057bc94a369716f562fd7094488aecff86c7f8cf9f085eeb. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZK6K2565771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792b5022d8865ea9f720f60be9f884bcc344a71b51d27f2d0de372974122ee17. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZK6K2565772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d1bb3a256f23576d6b2e4726f5708bc3965d1d680122241a0e1c2030f13611. 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/QZK6K2565774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb930dbf5f3606fc2c8ff12aaef9600f33b2e39d7bb50534a482ae4bac42a9f7c. 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/QZK6K2565775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e079eddd7a83f28218d337fe201e3138bd639a5aa2249d0597b51d016585a9. 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/QZTB32506713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658609a8525348eaada377f550537e24eb1414bddf65a9c5283a3104ed046117. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTB62563029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3c5a4c5182b188bf00fa004ecc530b28818c2be6c7ee18e3f9887d1490cea3. 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/QZZ792523642.