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 0x19a2d45aaa38c2f7489721019265ebfd3e5bcbadd9f1ab46c043c8638461292f. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/233496b6-1425-4b7f-811b-18bc193152bc.json and https://artists.proofprofile.net/proofs/artist/233496b6-1425-4b7f-811b-18bc193152bc.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 0x21a21dc4507ed5f4f770794799efa98c18e2988f8ebb25abcb3622f68c36411a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZMER2588826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a21dc4507ed5f4f770794799efa98c18e2988f8ebb25abcb3622f68c36411a. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QZMER2588826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57191797e9008d238b24a7d4b92603851ba003c0d2df2e03958941ac4cb52081. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZMER2588821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b78b45e8ed6dd341a1a43435be5fdf7e8e4ec7f9b713a75c984d996e72aa38c. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZZ7P2551044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ebc22f81aadf353eba259df3e967a3068b9b4e3ca7226ba25434f37bd1dd2b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMER2588827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acf192f58c2af7557596c9e150e6c5e991e377aec83367cc59e9429c2cafe5a. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZZ7P2563837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14348ade4845e8a42fe5c5d81de688f43a2c9fdfe4dcbfc3c9ce04440bd06b30. 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/QZZ7P2563838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc305ed1b9c9e5372af3ac3a0adcd8a930af79f44ad39cec0b7ae5f2caf5ba3e9. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZZ7P2563839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c933f537d3c2eb209f257d5d4cd0dc32732583fbb706663784c1c4c932e5ca2. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/QZMER2588823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03ed569d46c03dc1f72cca2a6ddefbe8844ffab4ae63e1534013f8ba558a509. 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/QT3EY2501323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ef1ad42ecf772b991e138a7b994d9b5c29b388184472b0d83ee0282179a223. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZZ7T2531924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb2a0c500e977ccb4f2fe0e6f158f72a0c88b4afe9d4c121401d515274e7c68. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/QZZ7X2584881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c95f4b82aa3754cd642a56cf45cd5e59b38e3bddad68e1467fed087511afcf. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QT3F62512721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f794ba0e02bc4b6b5d800f774a641ad687dfcd9d4286cce7a2f76df0018a6dd. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QT3FE2586816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17d63da100a95f229436d124363de09a852120e4ad2f2278cb80a1d9492a5aa. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QT6E72527931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2e7a8383482caf82a1729127cfb4568257b0d84f503d9d15489c5753ff7675. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QT6E72527933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a0d48f6a1f840b5934f13581c58a07f7e29568691bb1314fd60108660893da. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT6E72527934.