thumb|220px|Papyrus (P. BM EA 10591 recto column IX, beginning of lines 13–17) Papyrus ( ) is a material similar to thick paper that was used in ancient times as a writing material. It was made from
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf821ad85366e85b661239349e3c8dc8a504edee47c03842edad973de9622d4cb. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/464c5700-2008-459a-a35f-c4755cd4314b.json and https://artists.proofprofile.net/proofs/artist/464c5700-2008-459a-a35f-c4755cd4314b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0233010385efafb802ba0bad1a7a8af036b7d433aa712bd82902088e3bcc3b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USANG2268258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1931470d7c266b38dfb23f5bc52e208ae0b6f2d247a6b53c8a00bda7ac4be112. 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/USANG2228532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb14cd491a54a09ba3d90a8e212795d72bd6f2d422207c1e1d615612602fe96. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USANG2228533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92a669f14a481d0fcedb5cc41fa2bbc9238d5a96f2f6d3252dbb9727c47efec. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USANG2228529.
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 0xbdfbb237770f680546f7368f2e4afbafbb15c8da9c95f4cbd5f64204e428037f. 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/USANG2228530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458c216867b39089cf1d7b8bbb45b5af8132aee86d75da000da43f2322bb78c4. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USANG2228531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c1a5722bd6f1219aa73113ae7202df2121a8fcf4eed10c4ccd14703547f9ed. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/UKZGC2200556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24584bba4e89d66331d26680bf53c9ba6f5d85fe990bc108f2c27aee6430f97d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/UKZGC2200558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d11515466818110401b2a2b44aec75dfadfb049c2a816ebfa0ac407ce18a14f. 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/UKZGC2200559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5973e3729ac2416108e6b95d1ce3490cda6d658e6c31be8de267eb584acb1890. 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/UKZGC2200557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f17d40d1eecd2699db466499fdd9a08a069dc39b9ff0e58629f430adf112aa1. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/UKZGC2200560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36eb407e1edb65f3e7924d076c78a58f00a111f60aa457230041de3e2f4383a. 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/DEZC62275430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00147d0f22b63ae36e4da7a8984197e541291ec1263cefed6eacee1c7633444c. 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/DEZC62275431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddf6540e5205f1fe031d3911c062d8d6eadb5d57a9955a0f7d29eb4a5f7a59d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:07:32Z), 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/DEZC62275432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adcf82bbbc536d986798947784c0e4fe59de0193e8ec7bf19d994287d341824. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEZC62275433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b7f51b64693d0a0e16482216b4a8247a2b394d05bdd99e8fc803ddcaf7b323. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/DEZC62275434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83ef4df6200eaf8ba316395f30dca254a4fdcc42f255e728256926ac206a2b3. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEZC62275435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fcf51b5c877d5b45caa8520d49fed81d2fb1710efc22a31dd393a0e1972113. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEZC62275436.