thumb|right|250px| La Pulquería, musical group from Valencia, Spain, performing in Valladolid. 2011 La Pulquería is a Spanish punk rock band named for Pulque dispensaries. They represent a fusion of
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 0x50161ddfee970eb8edd8ddddc7a623e082ab4379fa8dbef64121a3f7a4771d80. 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/ae49e54b-8dd8-4c88-a383-ec934ae24402.json and https://artists.proofprofile.net/proofs/artist/ae49e54b-8dd8-4c88-a383-ec934ae24402.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 0xbbafa7c19415aeb06e3a1c23030bc7efe44c90ce7e023f488d0233a6ed439e00. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/ES5020300352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8539166c19d17542857957fdf8db3e373a6c434323586e8c6aadf21a8c73a3d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/ES5020300355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf2effdf6ed24e0dadae8869b055aa2a3716b453cfb682013cf807c98b8db2d. 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/ES5020300353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c58775db02309b766b9d9788e0913112aca34a6c2d0e562f9d9f400bc9c8b38. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ES5020300360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6777558818966e9afed46dd7a513325e55b4961e433aa7e1ee08acd0393f5c42. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES5020700119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238ab0b4dd78769d6057eb5ad16ddc5b4e3ccb75a0a487010590eae57ad7cde0. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ES5020700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb497dea291d8c9a45cffc27e62d7762b9f74c0afb09f603c4e835ec865f92a63. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/ES5020700122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46443c9b5b90dbbe6a2466f5e363db6a552e5c58deaa7db3638a2a9cf902e5a0. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/ES5020700124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04305c418c5f47ec51b1dfa144c6b942bae08d29d3ce29abfa8b776cb6893001. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/ES5020700125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3294fc78526939106ff7aa13bf56547cb06c9e87687839c8bf0b4d4261cb041. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/ES8241024301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fea007c52d100a39d76bd87d8645b6cc4d1d219109ffafd70c966935fe9fede. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES8241024304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f490bfbca5822b558099e0e977d86427c49333ee52799dd2e4db8b6e950e96c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES8241024307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f07cf2c9ed4b23dce6ce651cf0e0c271379077b1bf16bf3a57f393a5e75f111. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES8241024311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d7094a8590267a0a51709540d012fccb4c4a433c4afbd004582a3cbee69e1d. 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/ES8241626701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4954a44a3e21c59bf5ef5af96568e7483211d47b8092199ec4c97b5aeb2aa909. 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/ES71G1631900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf640e4b947c9453626c2e3e4468796f7c657805d2d2a0e9551ba1ef308983444. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ES71G1631902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd696794b5a5c835adeb91862d6b44abab362aeb1ef4fa1563416d3ddd6af3ccf. 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/ES71G1631903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4b82e2f26f692cbbebd13eb14b66d623d96c4d1737df9c007d4f5a81979bd3. 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/ES71G1631906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b3dbd3073a6f03bb98213fb2d6c95b0216fcfa8081e27d8ca5fea085bf7f67. 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/ES71G1631907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d1d21f9c7d32d17de7e34d0d7eb6b99ca08aea89883319f622ec0f5459b854. 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/ES71G1631909.