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 0xf733c8287f9aa41ea4a132d8af753b04cfe7b00625bcd8946466998c37ee62ef. 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/5842ce27-d7bb-4311-bd46-0201efdce765.json and https://artists.proofprofile.net/proofs/artist/5842ce27-d7bb-4311-bd46-0201efdce765.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 0xa6784e97864f16c33d988773d0b60d122355a98851147a4a854913913d034d2c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USZZR1100471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b498e8bb9f882133532ae7b995eaac4857e56ea5a81ae9654efbb90579e687c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USZZR1100472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e4f12f5f377171f758baeb9fe0a613580d0df9a93d65ba8ee0d0bbd948c7be. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USZZR1100474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4deb82cf3bd600d88b2f5b77d05e7754e027970200671d9b1e2b97889558efa4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USZZR1100479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a002d5450eea314fc26fb79f01195f332e33a2f2ae9fd429183e7e855b82844. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USZZR1100480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46a8e8f8b23753aeba8ee2926a7160c1d66de82cf2f3d74df98473e4b79569d. 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/USZZR1100481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36998fdb247d64c2d1670da91f656da9040e95df75f3bafb77d72bd9740ad166. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USZZR1100487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba74fc27a4ffffa81957abffb9cfc8b9a02f8af53de399e45c07f51b5790d99. 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/USZZR1100489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361c2cddf70bc5538134a609f813954f6a121d2b03e4fe1315abb27a8f50a8f5. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USBKY0507992.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2df38ba25992c76e4a1735185cf47eeee712b5c4959167273736a8fe87a4da2. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/ES60C1000335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023154958a53b273c59f467511cb608f4cf15526a2b0ed206be5d91c8557b9dd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES60C1000336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf8c07c86e87ba5ee25db8fa4de67cf8fce7676a0e99320aa4367a3871295bf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES60C1000337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f7c6904728f8f448f02862ae4dfdb9a1d7e2d6a9c8b052632fb91e5af5cd80. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES60C1000338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36142d5bdd5d2190f4ffad187bfdb200f03bc7b6e0c5c97dedef3f613c265f9. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/ES60C1000339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa2f24f2c322a19d6c62052caaecd9b7857b3fd1e2160d14880404d5168278f. 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/ES5630702498.