Mafalda () is an Argentine comic strip written and drawn by cartoonist Quino. The strip features a six-year-old girl named Mafalda, who reflects the Argentine middle class and progressive youth, is co
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 0x00b871fe17745078bfcd99b4fe9f2c2e7e72ea68f7b7844bfbb6fd7456d6dcb0. 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/f59fdfd4-8eb6-4b4c-ba70-938b56cc6ebd.json and https://artists.proofprofile.net/proofs/artist/f59fdfd4-8eb6-4b4c-ba70-938b56cc6ebd.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 0xa4ab54f2d0e84d8e0b744bc627aaab02379f21e0ce0628c9b2b87e08eddf943e. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/USV291365907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ee212328e4087ce4ffeae6e807ec34f421df6b8c95ca15f8af77e30e004d46. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/ES8241925501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a9bf055511784f466e516d4bb98300e2f25b65d2ad8967866cd6cf16fa5383. 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/ESA011504071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787c5b66ce1659c0fbb6c7b9d206b4802286adc047b8133550b7f4ac46f0cbeb. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/ESA011504074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb668e057176a13b81e94563e3984a0f80cef4f0a222071232dfa7c959d1f2e9f. 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/ESA011504076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c93636e8513bcab345b97ef3fa6886dd4ab3e50e5216aa02e078998d291c488. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/ESA011504077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e19259af3d35ec28cf0b1e09235132335a5f436aedbc7a148d275b952a1ec4. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ESA011504078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442cee85cb1e784ff48b53a743bf75c581e1bba06ae949d8d22ecc2255232527. 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/ES71G1844962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b96f8f5a1e21020fddfe92be8c05d8768ec366a287f7415067d251ce3242f0. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QMDA61582585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3637db4a40ac2e269f125c1b3957030f7a9d313b63c4e75081acab04e2c709. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QMDA61582586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e90b496dacba9a07346dbcf62f836f0916861d76da6d18ad7364b76c48360ea. 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/QMDA61582588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da55162c3a5470923feb8c35471f356825d5b77e56f244cd10c00eb617ae7f5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMDA61582590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8373b9ae34f850fb654440ff6c9cf9d7fadfb431867793592457a1f310e36ec4. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/QMDA61582596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2b2c5b6ae38c3029dd1a1e13a1da73250cdfac66502079e32047d78929fc64. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMDA61582597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48df0882431b0bec95708f6e85faec435648a0a4a3a217e3306db8d485cabb62. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES71G1844964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555a8d49bc7242295b04e315d6b4bbc20dff247386ad7fa56bba220cee267c2f. 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/ES71G1865279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd589f2ef93abd1270cdf8b3ce7e2de4f79756da75fd8e37111b2517a98c5de3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/ES71G1865280.
La Historia del Hombre Que Huye de la Realidad
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627223eda3d01f02465e0faf6a6bcc39e26b07b009fbe16ae7c53d1907d6d57b. 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/ES71G1865281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa462a97eaadf44c40f5c1a8dc741edead6ab52bdf41d97d22db53626272116eb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES71G1865283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4710603b335c9bae20812b5b56ab9e4a9f2d1a3fd8c67e613b028fb92d876b. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ES71G1865287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031946242d6543150393cfaf5cc71f9b4bc88ce12c6ef2b9ef2cb4cc4c36f729. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/ES71G1865288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09a479158ddb3c59d9b3b5f6a70821e842fecc971419c2f6952695a38bd37f7. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/ES71G1865289.
Acción Directa Musical 3.0 - Bonus Track
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dabb8684618e065dc08967f0e360632d46fc823e3c9afb0160d6d4d982510fd. 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/ES8241924815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dbc77ff676805dd9e35e0109fa52f1b2b514c8f3991e758cadeef5031d37a5. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/ES8242033301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a98ac36c895969ddc7ba0001b1fea662c1239492749d5bb3b625688c30e92ce. 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/ES8242138503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d55388a9668c46da3af8413817c58650d90f58bac57631cd7b857511cd461b. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ES8242138505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75428eb7ecc59d255c16c25d988a052e7fd92a620eb02732a01a13c9e3f6e489. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/ES8242138507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575de45976b7116cc480b0435866808a73a1eb57c8291d3cabfb17a7512a583e. 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/ES8242138508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a5f52e479661ddd7ef3aaed28e2a5f04d614e09c3a494d8f7dcb84f774e2e2. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/ES8242138509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931860979faa978e14eab9485a9f720ce53ec5e9d825fdeeb0a8eb0bf8f9da17. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/ES8242341501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78245a10745e4fe921d152ec4099a2416752e47f40a35600c1754d7902a49c8f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/ES8242341502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10832da5a9d341d1156542166a2f0846eeea8db913bb9fa40f93ec4026eb104c. 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/ES8241920703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49426b11bdd7416b4def25767fe002228f6a4d85252666ae86eadadf5d274579. 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/ES71G2015606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4825654b20be15d50da5fe3484706a3803994d9d65481f4ab7b300a92e0aef4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES71G2151682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613f96165087162963fa68e3527908fb14d384a7b23b86549ea0f7432ba0d3ff. 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/ESA031800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d91c29666c24fac6819d54983e65bcc55231bac45de1b971c793e1ca5b48927. 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/QM6P42205601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde710c2043791df36b11ced4b3fb449670e43e30ca31590a8bbf2a50fcd8436. 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/ES71G1771321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613f96165087162963fa68e3527908fb14d384a7b23b86549ea0f7432ba0d3ff. 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/ESA031800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696022587fddc99cfda59f4a62736b58be898e544fe342b17d6ada41fa81a8f3. 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/ES7312100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7217216d18aab893d85385b38cae57a9117d4b47aecb2bac9d03c195481d06. 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/QM4TX2329836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a2e824a5ba4458aab0a5c6840f6d6b7d31712e9de061763fa7e9cf961d3f52. 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/QZTAU2106008.