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 0xe96e4b6b0299f91222e546f8123f33c85497f714c1d91bc2e9194a8d2b7b1144. 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/7f0335ab-a61c-4281-b665-937b876dc9d1.json and https://artists.proofprofile.net/proofs/artist/7f0335ab-a61c-4281-b665-937b876dc9d1.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 0x20ab6efcf2a0a908b454f34718b676d30284be22d0be4f6d440c7ac5ec639d5f. 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/USFVZ1790162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907f00dd386ee82f8515d861c069f855c189348fd90c5e1f5ad28eeeed713c81. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USFVZ2090353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4e4d376763c785de6660d2265bc53ee3092b50caf46709d001a76aa9f32d72. 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/USFVZ2090355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372cd21a819aef7964b48cd8399a25be188e9068ef6404e79a1299e9977512d2. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/USFVZ2090359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd817ea56140f1a9419d87474c4ead6d4c9bd0079ba94dd5beefcf0de17f0a483. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USFVZ2290919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1930f3c979ce83c0604e8b6c0b53e7d061911d292463961cd8751e7f40f1e53f. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USFVZ2290920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd8df50f628a67dfcfc75ca405a216620454c21d808fe5ea9a6db659c15b37e. Chain 2 (Bitcoin): anchored in block 957561 (2026-07-11T11:41:29Z), 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/USFVZ2290922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314ef7a174fd97bd7099118d2d3056ace479f6b9688b44114cb246706ae400bf. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USFVZ2290923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181b509a586598e7579189bd326a966964ac56caa12c9b6327b5ed04fb4d1c99. 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/USFVZ2290924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69791ff469cf87d563cb19bfafef4e95623374c2d660461a4477b37205cb28bd. 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/USFVZ2290925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678c5f4bf579a7be2244ab1dede02fb5f94e6f6e39bb40b812c8a2dfba2cc7a1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USFVZ2290926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16b466203b301d572eb25c77acc1c3a47a0a185f268da0c4dde5c6c95c10e8e. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USFVZ2290927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d12e2fc824f8735dc5cd9b279404ad7ba4a0cdb46e3ca126b04cbadfe07ce9. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USFVZ2491224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d12e2fc824f8735dc5cd9b279404ad7ba4a0cdb46e3ca126b04cbadfe07ce9. 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/USFVZ2491224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cc408074c57f3396d30f4c3373e51e4da56e1a91dd6e0135d5d1ece9afd71b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM24S2305457.