thumb|thumbtime=12|Cabiria (full video) Cabiria is a 1914 Italian epic silent film, directed by Giovanni Pastrone and shot in Turin. The film is set in ancient Sicily, Carthage, and Cirta during the p
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 0x94d59dcce6f1a1c278cc88c5b811bea08c5e2794dd64ac1692410ada5eac4814. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6d04298-4761-4d59-9e57-01580a532e70.json and https://artists.proofprofile.net/proofs/artist/f6d04298-4761-4d59-9e57-01580a532e70.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 0xbeed72ffac4f5e1838c227ca9baf5d11cdb95e7b95f41e24dac5e9129df0e2ec. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/ES79A2117301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f09e4e2193d62d51e4b4010f943d21d485bc179be714465f4cd84d62f495d7d. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ES79A2117302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b3347bced2146a23863cbe4acf99a372243c4ad9e348fe5016ca981d31be3c. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/CAHQJ1930450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fe1f74a5a77c82f10003c76f1160a61e44f757520fae074f4e7ca07b5b3b60. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ES79A2015316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9e851b794c4f7be7b43ff0f1694be66150701fbb09e9ba930b28252524202b. 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/ES79A2117304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29997cb252f5e92e30ade651b0a838aa0c678448f707978434d32c08f95da4c4. 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/ES79A2215321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f06e55be76c40d9a74c2e4dde50231121fc3c2c515b80d57eecc2b383143c3. 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/ES79A2320203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e129e69f7e42f36bc54627f8f2ec8a7f66b4a0235340e3e90cac6036adc1f8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QM6P42445842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e00e5dc950c2b0100a11d2027c7c088d3b8d33738e55b33ffd49946b437d626. 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/QM6MZ2564527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd600144930d2f56d95bdc5d43c4a94a05f8d996947478fba7814ab2708660ec4. 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/CLEA22301388.