Nouna is a town, with a population of 32,428 (2019), located in the Province of Kossi in Burkina Faso. It is the capital of the Province. Nouna is a fairly developed town that boasts electricity, run
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 0x63b2c2a10eddca621e4f4b7d4fbb9249cf40539e30cb8219db1d2f1a7405e2ca. 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/c4c8b648-ea14-4f2b-b1d7-baf0a8887588.json and https://artists.proofprofile.net/proofs/artist/c4c8b648-ea14-4f2b-b1d7-baf0a8887588.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 0xe71dcdf2b93d3fbeab01ea4b9dfda0c71ddee237afc75e7b9a9a0f46315588f7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZNJY2374883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70843aad888d05be22d305512969e2e5349bfa5edb314b2868fa74a9691a6fb3. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/QZNJY2374884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfc54b130dce97ab3734f19b64b65a1ea1d631c62850156818b413c97cfae71. 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/QZNJY2374885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01c404a5afba1296237523bd1e8a4c1226d1f727dbeac681f7f02f4759928d9. 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/QZNJY2374886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f4b8eea43deee80eb577f8d456ec6584222bf56e307c8e4d7214758939a470. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNJY2374887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395768cfe90876a81e86a6fa60300d18f6d6304200c0167e813aaee73407d0ee. 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/QZNJY2374888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fed559c62c3f6e05414af9497a97bae75dafd3e2ac7b0d6204c394f65aa51e. 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/QZNJY2374889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc3114d46adce5dff2a9da80d4f1af09588bde52095aece43cf49c209841e56. 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/QZNJY2374890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafb72e283105b09b7d1bd5b62ea1641326503dc003240f99ab0b6cdd56f7075. 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/QZNJY2374891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38ca24c41aa4427ec90e1cc8f65d89ca43da8f15c9b8621599555636ceef4c2. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZNJY2374892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967e93486bff5e5aaf1d4cf125450a2790945c14a41df977f0c2a67def7cd60d. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZNJY2374893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232513d6a0ffe6c4cb8912f77f30c6515a5d15af93ae956cd7a04b94e01ac056. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES60C1000965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d83143d16d54691f931c8641f9f12d963dd202a5e485f4ada921d1ad6b790c. 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/ES60C1000966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda4e354d2649f35c31db8d6b5a7a8ccc1d0db8fe73d40a02f06b1f56c1e23af. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/ES60C1000967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7053eef1d114a1b3bd5a5377694139329b432ec20371173d52ce6c92d2b5ee. 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/ES60C1000968.