alt=Illustration by James Allen St. John for Tarzan and the Golden Lion|thumb|upright=1.1|Illustration by James Allen St. John for Tarzan and the Golden Lion Tarzan (John Clayton, Viscount Greystoke)
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 0x67548b6eafd010b2f6121d2003f31b2561ceacd76d7fd639b4403385a5b9d501. 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/a0a10b1f-b009-43c0-8e8d-7a214ce7475a.json and https://artists.proofprofile.net/proofs/artist/a0a10b1f-b009-43c0-8e8d-7a214ce7475a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tarzan 2 (Das Original-Hörspiel zum Film)
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 0x1f28a1d546541fea7e3c605705abb23675e853eff053833ac506c1000bc2057c. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USWD12320611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf88c94d1e4cebe1f48e062ef618ade757bda8146d35cad6d411c38703e53d77. 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/USWD12320612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4943c2c929805ae3c4d456fe99b7db909aa3b628cb6b199d0e1331291210335. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USWD12320613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0ca03c278dcfdfd4301d2bc2cecb77381757f46711b9668940bb052e9663ca. 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/USWD12320614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6348b65a69e192a69de2e9728afc7f62ba2ad8ee4a3d2af4462ce1079186286. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USWD12320615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013e56be71fcdefcf1459b1a38fa8d7e10587822a1233dda4fb26e6e5f1635aa. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USWD12320616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9208ef28e1370ec646119280621c564bb3260706eeb84fe4bc1cca73c6d68498. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USWD12320617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1ab2aa4213affb717c1eaef5be4db2daa7814d42fce6133d23ac3efb0418c6. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USWD12320618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719b0f3a67a9ce5e922c80df5222fc1184d2ff326e9de44157d37702c8218904. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USWD12320619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c6178afabb4b63c2e593dab291fd2c4c9fff7c2cb5279543a31024c1ff8eaa7. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USWD12320620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89525ba35ee20e84e92638f687457840388baeb535fb5df55ac415e6f8f81396. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USWD12320621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e467c2a80a8bd2b2fb9fe6acd4ae942fecb94b769ce615d5731235ef693f51. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USWD12320622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97afb8bcc9d2f0c5f005b9fbc6dd8caed0ce98fbaa3169c508398a098839ce0. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/USWD12320623.