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 0x7277b64e4d56034544c89893f8176d57e51a9e3d196dd5f38e0fc2036e2268d7. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/250c154e-c16c-4a33-a4cb-5fa7a0f57941.json and https://artists.proofprofile.net/proofs/artist/250c154e-c16c-4a33-a4cb-5fa7a0f57941.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 0x048076fc43961d738517a94530c654043ec810f48cb1601900572ed7265fb746. 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/QZWFN2367913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38cb2e96488b54825d403f8bfde098138eca7751e6a40b60c58830fe5e8a9bf. 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/QZHN62416860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d8cba46e158c8ee0ae5153c9a6ec7575082aa21c4a46615d40bcfcdb23075c. 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/QZMEM2455391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fe5e0c7a9a2684b5c845d130dbd911da150aa5ad94d21ef5d5f72c156c7856. 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/QZNWW2422610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c9728d3b1a370b590bacd62492fec74a76511ab6e6781b0e78c82505bb3d18. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZTAU2490832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a0c06417eb7edb642ee11a5e40ee545c2771fb35fe8ee3b21bf991949154da. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZTAU2490833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0735230760a8f579649b92f9c1de30ac5699da12e786aade3f83cbd5d7fa656e. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZTAU2490836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92fbd9c2e08884380f580398335981b60ee2aa1bf0a69a36faf88ef9e42963ed. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTAW2443735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c336db616c9b4ab93d5b1dcb0df95fb28301e74884a8c0ce0eaa52e61793ee. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTB62410792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81f7e8e276362b0632f5b4f334701caed027d808cec487292a5d2e95f54c756. 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/QZTB72445419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109c591d7541d1ec86f53d88d6b4822dac806df68195f2a48a20a5256d5db527. 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/QZWFG2488455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffbdcfab964bff76e144fcd15f5bcb74eecceea38bc5a6949aba2dbd2e81398. 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/QZWFR2481737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2ca209794f651346c8dfaac3d02035500b51fbd7b778bcf0d4ff0222c04514. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZZ7K2487136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57764a68a497c7f61511db0821c4a417ed2ef26c11b83cafbe4a3db1b4ba9505. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZMEQ2584597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14026a35e945dc836842385b02d15419b277a0e9d849a8e14b1841c789a73bc2. 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/QZTAT2551804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e02d6941a710830c155e1abf36df1fb5a76b67cf49d2c4fff7245ead46d71ff. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ772519255.