thumb|A feedback loop where all outputs of a process are available as causal inputs to that process Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause and
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 0xfafad77cc0055168dc07ec4f93d0ac29c2472d32c558d155026b279e9e7278ff. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01786b49-97f0-4cf4-afb9-1264ad39de83.json and https://artists.proofprofile.net/proofs/artist/01786b49-97f0-4cf4-afb9-1264ad39de83.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 0x9e7341dd49f4b950fa1e99abf8144a706051f334db7025550d52c687c88b3342. 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/QZYFZ2477057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c41f684053642efc34508a39f35ba0ed996cd40123e09a7486521e00020b6e. 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/QZYFZ2477061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5efc6de632793a93a27e6dc483aadbc9b60ed6c8e8e2fe67ad2d35ee9d16d5e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZYFZ2477058.
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 0xe3dcdce40c7fafcbe988c48c5f98b3c5fa2cb6f885793d61e733ef0468d24c26. 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/QZYFZ2477059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d70162b256d4c80adc393939a2af8cdf4f1307f16de4ad214151db8f9239e0. 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/QZNC62103545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638f27ca33e442b3a3f03170d59486253b9fefb3fd2be5c8fe2a0a633f9d244c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZNC62103549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc335c2325afa609123af1e769a9a3b435a778150b2a7ec0cc84d969a37b081ba. 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/QZNC62103552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d75f7e8d48c76f8d0480e672b07c2f2ae4c7a4942b4fb6a0316a73b92c771d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZNC62103553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e7c2678a664e9e8c7a0fb588f193cee99e43180e7b212338222fdd271540f6. 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/QZNC62103554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4466834adb8bdb4129df366f02740b9c5641f0ad73f93ee420ef1dc19c241cb8. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZNC62103543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06e0f08c47df218fb09eca06f9678c797c08706ebc1967bc6b9a833c9ceb4de. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZNC62103544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aef9eee111241c19ff4360b6f50a79315d9f690f90c91dd4db3adbc0eccd7be. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZNC62103548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcbdeb596a199a7458ac4303c201e9f2f87c79b7fff3015ea279cd83cbcb57a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZNC62103550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67aa18fdcbf4761e85b371e23435275a9631884e917ce241be9d9d10c5ec430. 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/QZNC62103555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0719a733f1548ab7a578f87bdaeb534fdd673ca11f16c34bde61db567743d1a8. 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/QZNC62103556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be2035e4857b3d4dc508cc0875eb90df03efd5e0db16a2382b6a427edc5af03. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNC62103557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe3617b6957f4e88b263d53d742cd379bbde1304f3f9f90903172d38a1ac2d3. 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/QZNC62103558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51cc3152bd01e9b40f1736535daad4616e2b73ea2354d94586276f1d034c86a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNC62103560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0350b00f71d3a1bb7ebd73c23796c56e05fc35e35e25d96411e968b8ac1cb4a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNC62103561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe974a5a637c4c3247a5e20321c6e9881a8b5408ded9783920ccb2946f858c145. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZNC62103563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41d631e1d239e0a93d523b2189c6b4a315316c152f4c47645b6471d5e326cbe. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZNC62103559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f9f34862f8988e48bda4549e8ccc73841097e2a678282015a71548921f0982. 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/QZNC62103568.