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 0x754b4563601c5bec4cc1a10ad2a668922e28e09f862ca79f6554e490de8f9f8e. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c29a74a-3ca4-477b-a80e-de290185b0b0.json and https://artists.proofprofile.net/proofs/artist/8c29a74a-3ca4-477b-a80e-de290185b0b0.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 0x7f46a2821cb8b6f22866e387c1f047500f7a95ffa53f19aa9b5dcb91a0b3b85a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US7VG1438092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf624cf19b859a25fab383c38174c79e09d43f6d903cf02e875e3f5d5092f89b. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/US7VG1438093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b18f3dd1d5336386d831f7fe8da65f32bb9e107d5cb9317efb06939d29acb8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7VG1438094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb64e218fd6a45bbc5f36371f4a114ff093c7add9829f05910311671e380518. 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/US7VG1438095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b1c211843ba8b7431a2888e5d2648865f8e0c2c8fbff3cfd354b2c77bc7933. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US7VG1438096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49300c662f0ea8390faa3106cca17bbe810a43ffbe4aa2626d84ee8aa29ee60c. 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/US7VG1438097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83bc12feb79b3cbdd09bd4ed355f3ee90dc3fd63a067af489effa9389ac6e49. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/US7VG1438098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f335dd0bd1e4d0c5fd6e13fd294c5e9b0762c0e04b495a0567107e4812b47f5. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US7VG1438099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4cd16149de96f334e4c1905f8c7e87b8ea065cacbdd1c23a793e63d990813e. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US7VG1438100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb66c6403c6604ebbd86fdb78c0dc4b863a780cb09345ebce73cffe00d0cd9be. 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/US7VG1438101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8538aea270a2e9025486d629e52e7273181efdd43a02857f11d304ab3baead6. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/US7VG1438102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9e3cd1a62d447666fdd95e18ff31782fc4f680eb0bf56cb33611810aa9b7dc. 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/US7VG1438103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4528a911037bd60bf4d3fe806aa1f24d9d2cfc981d0070e32397761de911b9. 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/US7VG1438104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba3223eb894e53e0dca9934d0f84c67d5feeb50a1ef0d44d7ac2d112d84deb2. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/US7VG1438105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d26579b9e51aa1829ce3c99dd84076f6fe55b2e4937bd578155209e72342a0. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/US7VG1438106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad783d2f3b747ecb6710a2c218e5bfb17d89418cb09817046fc6d37e9d1c6a9. 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/US7VG1438107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c42604ccef483f2e3f3e91adb3b5a6957826d969fe93653eab37bee9053f5d. 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/US7VG1438108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e2040601c481d763bddfe8fdcb943f210063611f37af0fa6ce4c61047414c7. 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/QZGLS1941412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a97520fd339122ab572de1f5e13fa99f01002b5db8d254941d765f3ce7d12c. 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/QZGLS1938916.