Sadu (; ) is a commune in Sibiu County, Transylvania, Romania, at the foothills of the Cindrel Mountains, 27 km south of the county capital Sibiu, in the Mărginimea Sibiului ethnographic area. It is c
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56a89f5234cfde60c27749a298eb80d5e81b19ae1ed286d540a4ceed08f5d29. 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/1b7d504f-e2e8-4542-b699-0a972246a91e.json and https://artists.proofprofile.net/proofs/artist/1b7d504f-e2e8-4542-b699-0a972246a91e.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba05819451000b993dd628b6307312d854480ea99b6149cf9949d074b77cf607. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/INUM70502739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb31588b7dafa615ceb12fea1dc65c48970cf58e410fc2fb0fa2aedee958ccf. 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/INUM70502740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0453f110191b869f45d75bba30adbd3b4f898dea4c1cde3a633c4beb006b89b4. 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/INUM70502743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67093239ab8b90c085bf8b80091c1a289f38ffa52297d43d183546f63d4fd32. 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/INUM70502745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b76d05bd6918953b6c1cfa674e42f2dad62087a57e9525cad480fa6a0f5011f. 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/INUM70502747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe697868f02d4ddafc5874ea4bdf3ffb1c4a9e0a7bae713b0aac769724f84275b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/INUM70502654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7da47b9702fe7404eeb4b2388d44512037b34d3f579dc98e461311d36fd3a15. 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/INUM70502665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71145f8c7fddaec69ce52ee0c5197aa0987d9cfa098bd84fc99eb257d21f346. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/INUM70502666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2701b584a6bb5f3f48e53e8cb70f443e02d9766ceb3cad15f203b34d76b8c40. 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/INUM70502667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dc2d0742b3d4153406dd05d1e1a72d9fd27b911ad6fddd2679ce2594425765. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INUM70502725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e30bcac2b58d9681633d6a73141eef47a0b93ba64df456fc374aea799a0cf6. 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/INUM70502727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2595f97b4730a30fd5feb7fac38494601dafe36147852721bf454cf9cb2943b2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/INUM70502520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d1c99f956bce5f409c32df2610ce5213251741fb69bd760142e2e3ad62ebe1. 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/INUM70502521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb294e0b9748f90847db880b2befef03b02b292f45243dc63ec0d3675d7e68004. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/INUM70502522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810ac6a62ef6414857002ebf5f5ba3cc2b1d781b1c59032afac1961eb6bec796. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/INUM70502655.
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 0x06ea2f7a9a89c5cdc5dff8b3b639a4962fda0ca5bbdd95a39f72e27546946733. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/INUM70502660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ea4d5ae6ac05400af1462448c3949582bd36377b88a45789688177597ecd28. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/INUM70502668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88e4980e7aa02243416fd6acfb0ffe0d67e4daf0c80c72e7ecfe6f74d92a5b9. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/INUM70502523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad90ea649f7f06225abf2fd8dc8259d78e1d4bea44b14c0f4bd52308a154039. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/INUM70502525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3555dcf03ad6c0e5c113c5032e096a8f1b54e6547e9181c55e2d3e9ead6d5311. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/INUM70502527.