Proof most often refers to: Proof (truth), argument or sufficient evidence for the truth of a proposition Alcohol proof, a measure of an alcoholic drink's strength Proof may also refer to: Mathema
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 0xf9d4260bb8a923de04f9daa0427d86c931da4eca601ced071e646316f07d2d50. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/652761e2-87a3-44b1-9242-277aa8b7c325.json and https://artists.proofprofile.net/proofs/artist/652761e2-87a3-44b1-9242-277aa8b7c325.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 0xbc8724104530728e89e422d3937611985d06ec4f67bdd7eec353891d4cc302e1. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TCAEB1977290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbccb31e1f56c77e734156325474c0d710acb82a7a0860211920daa429e625a92. 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/TCAEB1977296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f5a2320324645ad8d4b5e6401cb8274dbed096dd038edf7d66b6141742f3a1. 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/TCAEB1977330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdace8e02affd9326f1aadd6e64efb509bd31ff35817d28c77b20fe65181e119. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/TCAEB1977337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b442a0633e53f2876446230bb8b5f4a241e701b7df07687bfe2e2317a928c58. 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/TCAEB1977369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273aaa6c65e9987213cca525ede0f67f595aad34c8a6aa6a17b90cfaa6e76c5e. 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/TCAEB1977409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe58d141ae7cfd071b1b003f634ee162873effc75d6cccf0faf2b2d4fe2c734. 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/TCAEB1977430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed28e1ae9e2bea0f595f889ccd740d4e796335a6bc686bd9c3b6efa579865be. 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/TCAEB1977461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ed71a765e366b986ea012369a63827c2be11a07eff494b7048e072fd8a401e. 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/TCAEB1977489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a7b91f8dde64b311aaad39978a9bb74fee14d54e60c97a688c6cd0a3a46ea2. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCAEB1977513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc8f91a21a262ac35f2a45422fbdd0b17795ef6691ef90a300ebd0e600f7354. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/TCAEB1977522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd839bc67e764d884b1257f0a85733001872a31df277b5a53413fb27d76fba56a. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCAEB1977532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17665b0b91a2f8234e1a16ef1925a3f3b591f79be84d4db6877964d990dafb3. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/TCAEB1977539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c30a7d76cedab0f02eb25aa795e8ba69f6af21fcf5d473ba910fcc76ce08003. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCAEB1977550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb2a5ac2f13eb58d163903ae49336c9b3e8bd888894d14175fc305e916304a7. 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/TCAEB1977559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196ed9700840c26e4e0ba6c5b306d1447a510422cd16afc0e8b6fe148d25cede. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TCAEB1977569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524024014c29d657be49e1ef18c38537092e375a45a420f4ab84ce0bbf9a961a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/INS182000840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c93736f7352c88eda835cee2454046061fe2c66b08ec57040cf415572de979f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INS182000521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811e5068cfe63ad5c356d806f0b0782d7a7d9225b5038c62b09a1355d1918b01. 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/FR10S2089485.