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 0x9de9eb49cf0355ecae5c6986629fdadcd663c4c0416685de59d7776a3643f350. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e8c19cc-8715-4862-aae8-0f6fbd00dc1e.json and https://artists.proofprofile.net/proofs/artist/9e8c19cc-8715-4862-aae8-0f6fbd00dc1e.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 0xfb329237ae262170fcf5723995036f55c39bf805332c2ba4d5adbf5946b0c699. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZHZ41989431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae14423bee60264a5d5c45f4758bfb23fcdedf1aafd842d6a3ab128c0446ab55. 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/BCIOS2400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbbd1a96d26bce6a49a4cf1eb36c11fe62c46d219345beed2dc6f70a55e2208. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BCIOS2400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69efcf4d39c86a4eefa41813def8476ca423e9c2b576ff2a9e348914b872198. 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/BCIOS2400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c79575fc7d9d1ac1f112928eb50f936032e6ba737a820009aad37f1b30fb82. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BCIOS2400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4566dbe27e87aa74fd89c20d7b6dd1336716672ead9d466ab00537fcf9bb408d. 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/BCIOS2400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e39f0bcb8a2cb0c284ffbd6d90f9be3cf8e9fdba78e75d039919c6bd20c04b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BCIOS2400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f8ac878f1a5e2af30d4af7f40ed0733e61bac0b41f8a637f5d15d1e9a09470. 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/BCIOS2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26e7150784d2908f125d6829d6a1a2e3b260a4227fdf7d73679fc1b38dd9b71. 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/BCIOS2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63be3b3489e7570056902b3f1e1bfeece577d832c56e1929f4b48d669751d5bd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BCIOS2400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0552caf19aa0416f2971b97dd6f20fdaf394bd6482ec8666387e299b4e580e1f. 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/BCIOS2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a040ee96984531383880365ffa63b3f6553680b3d1c8eec3af99cf90b68277. 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/BCIOS2400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2c18966255532adb1ddef4ae73e0b0f853f4441c051662c398f92ec1036c66. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BCIOS2400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a42ca42789201101e63d0c728febf32dffbe39780d63b5a3cb374301cb92563. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BCIOS2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bccf50274ec42ebad384f50f36c090b39e09b0e5bdda37455e636bb3eda7f85. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BCIOS2400043.