Barbara "Willy" Mendes (; born January 30, 1948) is an American cartoonist, fine artist, and member of the underground comix movement. She is best known for her work alongside Trina Robbins on It Ain'
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 0x817b0bb7a4d6b07ce3a803e6d1d57965a2cb3f043792a5d648b1f1d44d620ada. 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/82453e05-8cac-4c4b-82a4-97d0fc006639.json and https://artists.proofprofile.net/proofs/artist/82453e05-8cac-4c4b-82a4-97d0fc006639.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 0x0253c5003c21749efcdd6c658f68bc2b3f4d649ab28ae02ed55285008373a77a. 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/BRB580800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb175f81f89c7b32a015ef677f7c54459bea00f5e1c646f8f37951a160f092dd6. 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/BRB580800156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e720ae02c907f1d0a19f7135329d96366c0c3175442c9f232d730dc81e56eb4. 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/BRB580900217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05596386b0927fa8f10e89f73ffcb9b266d29fdcd68c38c52a8e3b5e5a7f3624. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BRB580700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc124c331051023805cf654e2449ab74e9e087f6f8a7bccc04f065190a862db20. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BRB580700113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaada23a3f2b05e889ce705393decd3426e762859c326267c01a40d370a355641. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BRB580800009.
Jai Ho (You Are My Destiny) (Bossa version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b81fb735c2a4f325a5cf1ff76a1b0a0c55d6670821e61751643e7af3f00cee. 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/BRB580900122.
Don't Stand so Close to Me (Bossa Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62e167c95e75d1823bbcd0ea00cb843b281a4f4b1863ae6add8601ba1e82da0. 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/BRB580900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e274fc74c0a39894f433ec3562761d1e46486494b5a3e11856f16de58c0a3b. 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/FR6V81584129.
Cafe Bossa Brazil Vol. 4: Bossa Nova Lounge Compilation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c0ed63896f4d38912524cd0b4042d95f76a09366bb1fa0ce2e0650da6584de. 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/BRB580800157.
Bossa Lounge Brasil, Vol. 3 (Bossa Versions)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0253c5003c21749efcdd6c658f68bc2b3f4d649ab28ae02ed55285008373a77a. 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/BRB580800102.
Cafe Bossa Brazil Vol. 3: Bossa Nova Lounge Compilation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc124c331051023805cf654e2449ab74e9e087f6f8a7bccc04f065190a862db20. 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/BRB580700113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb175f81f89c7b32a015ef677f7c54459bea00f5e1c646f8f37951a160f092dd6. 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/BRB580800156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1281302c1f770111334446d17358a16658d132494bdbbd8470ee4612b9c7f3a4. 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/BRB581100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c476b42ae9366875bf9f3bc17b5b9cc49da228b3a829be2168b21152eab18c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/BRB580900039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05596386b0927fa8f10e89f73ffcb9b266d29fdcd68c38c52a8e3b5e5a7f3624. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/BRB580700112.
Cafe Bossa Brazil Vol. 2: Bossa Nova Lounge Compilation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62e167c95e75d1823bbcd0ea00cb843b281a4f4b1863ae6add8601ba1e82da0. 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/BRB580900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20905ba3141b31d42cd3705ac11d6220f02f3eba0573694fcb4364fca8a7007a. 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/BRB581000036.