The SEDES is one of the oldest Portuguese civic associations and think tanks. History SEDES was incorporated in 1970, its founders coming from different academic, social, professional and political a
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 0xdb6231ac8bfcf75a0addf9e3ebf6d5581ac1a850b77daf56560f3b74472a516e. 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/111b5d37-7f6c-4d43-a2da-c3b2ffbda6e6.json and https://artists.proofprofile.net/proofs/artist/111b5d37-7f6c-4d43-a2da-c3b2ffbda6e6.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 0x1c45a07e1ddb85a28f53440783ec87f57a6f0487a4e725a09c355212d54fd70c. 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/PLI365332200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d77207b3d9680b5ffe9f274f1814c0d77e148e46ba7accc7320f83b00b39eb2. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/PLI365332230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c32f736dca64b0c5f936d018c4bf612d5c10042777b407cd32512c100fec5f3. 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/PLI365332250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9aa2a6cc15a9cd40009dca4581244783d1a944a063b7ad4c307b8fa605a155. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/PLI365332260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb023d18e8952efed98db37cb67f8df1730e170ce32e8d9e6c4683152dbacb73c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/PLI365332270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22633e53a8b503414b746cd4a6cbddc4c6cb941a10d6d11545db880250db1e1. 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/PLI365332280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd263f5be80c20fc4d384a44bdd7af11e196b3dbbcc357ef2e9f1ff936fbe4014. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/PLI365332290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6614ff7e7d09eae1af2a0fc17a218f7acbe3ed49b68051c7cf137432206b68b2. 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/PLI365332310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952beeee1930f2979d382889ebbeab423f4bcc291df0cb6c15fd552c70943a55. 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/PLI365332320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa944c0d3c62b2835bf2a1cb09f80a9ed0e1417182722e52180bf8c0d9e5786a4. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/PLG251700951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8185266a3ca38ff9142b829b6f9445acfe1ecd7d7c08b114308cbff877716fbc. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/PLG251700954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343941a0d28a4c0f36d7d6cdd6f18463d416baa4ee2106c8e5556dff112a882e. 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/PLG251700956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91e6eabe60ff8f3ef52dde425ecec4681544cb892714eb568651695c1b6f120. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/PLG251700961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43d94d293641c2889c6dc1248eecb0ea4bd8c064d5846e864d4b489a153e53e. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/PLG251700962.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574c6bc2debfedfb1ca7f288e0d45732b225a4bb6108cb1796e7e315fd8878fd. 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/PLG251700963.