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 0x207cb2a45fa6f035815e24a9f76a5558f39e27c37abe50d059227401079b8896. 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/9b190ebb-df6b-4c5b-8445-7f626bca70fa.json and https://artists.proofprofile.net/proofs/artist/9b190ebb-df6b-4c5b-8445-7f626bca70fa.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 0x310061d31ad96a46d1318b8bf09d04a1900c9fce574eb1db679adcc8ac5f0c6e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBKQU1717281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79769d4f3309db766934028c097bba50663c7d019ab3138a4b959db85cb8f54b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/UKVBD2000116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c5d972c28ae133e6219dceddbbd986b646686ce52f780eac979f5366b63095. 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/UKVBD2000117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e55091c0d4f64336003d926982fd8bdef25b1e903dfba68e65640bc8ffb5936. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/DEG932304846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7747311a50ff480803aff8c9ba55b9bd7017c2cae6d3588004de5bd4d81cbea1. 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/DEG932304847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb671dc2b1982574b97674ddeb52038c8ba4750ab9fe11bcbfb26df930e210652. 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/DEG932304849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed91cc38acbdaac3e46cbf3c571d02476990e88e23c790ba905dff64a8e778c. 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/DEG932304850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1efddaa29ce41f871e9ba06f94fc8efd8d1dfb481633655f54372197982067a. 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/UKN6K2401719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482f11086abd806d4acdce84786a61daf6f14a1739f8c634e975430bf89f0b40. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UKN6K2401720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702ce429164224720a9ca24128231594bc943d20f8243446beef083160eccdec. 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/UKN6K2401721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf834935428073f297e8bece40751f5f045a3ed2986b5fd6891a861e00a425f0b. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/UKN6K2401722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c65c47bdbd4b0975f9fe14ec3c7d32bc05fef6346caa0a5139d2bb407f35364. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/NZSU12500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4398b3e6b1f1e03cd0b523e57e88e5d1d43b8b77c81109ba512887843cbb8151. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/NZSU12500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528f1f68d2049d7b394b8ba0014f621120f186e31b02e473081e2b2c2be068a6. 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/NZSU12500004.