Claridad ("Clarity") is a Spanish-language weekly newspaper based in San Juan, Puerto Rico. It was founded in June 1959. The paper served as the official publication of the Puerto Rican independence m
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 0x349c10b197affab6cec85fd7ecb2fa66a904bac21596330df7b4a6c9de3f675f. 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/1f9762fd-d2be-4bfe-ac8e-fec3866d1645.json and https://artists.proofprofile.net/proofs/artist/1f9762fd-d2be-4bfe-ac8e-fec3866d1645.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 0x5836414328b9f2b359b04e4c5351ae73e13515c055b259046dcb412bddfd61e2. 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/USHM21557699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce092cc23da83b64722607500259ca24232caa04a1720089c82909b3ebf3ddd. 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/USHM21557700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8f8632235496c510a5de1710100981af8eabe02deb834f1317846428b5c6e2. 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/USHM21557701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868e58e121097f88cbb8f873406819f28dcf204c51a9f0dce971a68ae0f3ab18. 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/USHM21557702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f95a73739d7e1db2498dff60c6dd7e555181ca32809fefb43b804996ca5e61. 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/USHM21557703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ee8ea0eff947df4ddfce87af2af1b7400d2683353f5b4140212100b72fce5e. 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/USHM21557704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe616b5f7c711a26d8789293c301457b24dc2b21a09b61f20b014ea7ff6016aae. 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/USHM21557705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e39d19acb6bd5bf3ee46253da6fba836da14727666169517df77d1ad6a9e20. 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/USHM21557706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99abc64c60dd1b52fafdecae29f0988345ecde5c2ef0b8f9bbccf96ace561379. 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/USHM21557707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbedfffefb5aed1af5adb7cf938e32f5d48ca789d06e8bb47f5a639c821395f0f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USDY42060982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631301a4212d10c5572e7b07d1f8a95240d42fc4a613dc0af7b8724c4fdb0752. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USDY42060984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552aa4d3ffc91cca2728fc157b4fd0dd09c47557c34700ce62f17b0a1343304e. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/AR9022100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d810416a1cc4fce0c3af9dd8bf30c4323c467de29e2f28f0bfe71c049c64625. 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/AR9022300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631588e65960caaa12854ddc5ded1d2dd943e1f1e1e17e393b7bea5d3f1d0b64. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAJQ2566224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846b0e1010c752e5d5a3d16caa018423b9aec20f90400e2d25b3b20eaae0aa79. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZMEM2044264.