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 0x86b2784681d370787b103659b069829fcdcd11581abab6fc6331ed5830c34e3a. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c07fa4c-2092-4186-9cc3-4e04e635eac9.json and https://artists.proofprofile.net/proofs/artist/0c07fa4c-2092-4186-9cc3-4e04e635eac9.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 0x4dd84969e45f7dad187be03348cf63d88eb6af4a24b4bc9d56774713da26ca8b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PLR862100183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356a078c52dd1b02bf354381aeef77ee3ab269607a33f764e946e285e02fb385. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/PLR862100184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425be28bf1038e653e759814e087a3e42a3c804dd91d99c30288fc3c63f4f622. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PLR862100185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f82a5f2b3375fadf3e24e726a9f85d6ae0a3d8a8ad14043f8268a73156279e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/PLR862100186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9261a79e8e689e34c25762d53ddf144ad9ce346a9af6599e2d89f7515c413a3d. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/PLR862100187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7bef8de95c3f07e5449edab9c1ed8b08b587f8d236767466b0a5c91e54770f. 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/PLR862100188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3886718eae12816c92a233db79f658abd53f0b390609c36cefdd0881482cc62. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLR862100189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10dafe0479be9b56b9f81ff718c4a42e9154bd282232db318d9c3b8d4a7866a. 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/PLR862100190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7839fcc295e58c52bf86c4dff19ec96cff874f911c8247a55b56e9b7a9a58d3b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLR862100191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e2dfcfc02dcd29deff1f395e0a63398f22238a3eb6af4c1f564d898d0719af. 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/PLR862100192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388d159ad45fbc6dea99db44f9c55b68a1a4a2470837471f10084b11f2244c28. 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/PLR862100193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46e9e6eef758d9aed295b37a098e063a47c08db20f2bf01bf5ebfdfb7234ccd. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/PLR862100194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a501c3c60dfe5d7932ed5f0bcc164fc33cef89e484fc86a2dac195dad60cfd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PL89B2000362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe878788b8c00af306f4d4fc9a1a271d0cffb0c2fd0a61f6e540cb11647cb3803. 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/PL89B2000364.