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 0x0b7b513609a00cc88c4d99bb837d1cff5db2e82275049a3504d833b84db62b20. 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/f7bf403c-1972-4583-97a8-f2ff44231a61.json and https://artists.proofprofile.net/proofs/artist/f7bf403c-1972-4583-97a8-f2ff44231a61.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 0x25cbfef6103a941a3670ab0c8ad39495c94a335c0ae867dbf7349c747140d9bc. 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/FR9W11615295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7d9ddc2aee292ff050cc39a6fa9e5247377a8ee3e64242c022e4ea654caf92. 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/FR9W11722254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7d9ddc2aee292ff050cc39a6fa9e5247377a8ee3e64242c022e4ea654caf92. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FR9W11722254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627073683d2b5cf3dd501844b3741ead99b5499182ca8d78474c15f0985570b9. 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/FR2X41981558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d13a530606a997a90a195d6b8f1fa3c3bb4d9da517097d98d90b25d689bf1cb. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FR9W11916883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a65dd3d15554c9f139511dab20f25543ec0052f3c57436cac8036d4ec765ffb. 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/FR9W12000914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53bf9c3db8ec94602ce770829d12b1466d39a94bf2e3cc54b12a87ea3b404383. 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/FR9W12003844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59cc504943a29bb8dc0195c8ea579bd9538bb98cbfc168ec6e8ff68a8bcb2785. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/FR9W12003843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53bf9c3db8ec94602ce770829d12b1466d39a94bf2e3cc54b12a87ea3b404383. 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/FR9W12003844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6c4e7e4863535f2680f6a7f21341f73c6f9d92ff2bf679b1ccf3587730bd4d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR9W12003847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07909b9bc591015250243937c634940eecbc605ec188bda8013d62255ab269d2. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR9W12003848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c5afa7b7309dc36deef2b18e7b52ec35072523183d4f828fb3d1487fcf1ae7. 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/FR9W12003849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573404d75a804bac56647d8b619f5a3ae90c512df8ef282e34d47c054f4577ac. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W12003850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084d1cb5e151ed4ec51ec33aaee529f5d81bd655db7903f38dd7f441454ec876. 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/FR9W12003855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615dc073bd17f7fe4e06419b0464ad3842bbc68787e1534a7f04c6a08705a19a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W12003856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ed4cbb30e69e9c5befd8d38118fa4455a8605907ab80e9252e52779e1813ef. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/FR9W12003857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc930526c88d28c0317f0a1a4e9d0cd42ad2827504cca9a3623739ac1541801c. 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/FR9W12003858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10db5c63910ccd80d0abf70ba25becf6d24db191e7d0edac6865084c6c8f5b7. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FR9W12003859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a707b14735c83e413149f616ee4ba638b6e0869fcf6a8e48b709b2b9f4cd11. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/DGA082237178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997a60b834c4a456180cdbdc809fb395cc92ea13766b5f6b3f7eebb5c4cb57d6. 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/DGA072373539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc844538b8a5587098d8124465c6e62dc6441473ca811df1d9ae8c59b66adb126. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W12419888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0158d6e5563cf57e9ba7feb8ffa8c1849f630d884874623cfe06e41b5d0c954d. 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/FR9W12419887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad18c30bac73d62a75c852abda7aa5339d10a1c3c06b7651b8fb8460ed9a6df. 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/FR9W12419894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d477c0cf4196dd2730c0adeeba6a09d8827ef8fc62f44b63a88fc25dff86dd4. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/FR9W12419885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d1ee729c03316b9d4d39302c254fcc70ba4c6c6a18124059b3aeb5086d7805. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2512421.