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 0xbfdf7c1e0655252e644d86304ed2c2c256b8a754f41f51d65402add886ddd362. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/251449a8-7225-4309-8424-86df2a08f2c1.json and https://artists.proofprofile.net/proofs/artist/251449a8-7225-4309-8424-86df2a08f2c1.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 0x92dbbdd8a5a4246fdfbd31a7455838f114695acadcb2914e4c6fad19e769840d. 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/TCAFS2100377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a83960f460d30fb287a8ca46eff48eef03a3f2bd6c17d8ec477e8b68c572f9. 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/TCAFR2179324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06e845cf2c02aa6c9ad33a15ab1af400d011e267fa23d2863785a43c570151a. 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/TCAFS2100382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8c4062763425440a91285e5a6e468b7711f14566ec31ba47a092ee04f1b53c. 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/TCAFQ2171276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c54ccf9a4d9b5e059d9eca1938c4a87ad36d7396fb61c7cd0fcad21f35ebe97. 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/TCAFS2100387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a8bdee9ad4366b3f83a1adc3005bc3f94b3cb7fa261e83812f31de10e2e8e0. 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/TCAFS2100390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6828653b0f54510a2e32de025d5ea2304ebc68ac048d0654b7b133199a2bde7. 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/TCAFS2100391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61aae8c23f00b3b728f57b573b7f5b1c16b41c45c71618be249ed512a74bf55. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/TCAFS2100392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118c7829cf804fb6e59747d08ec03532423fd3cf02d9b2c7ce483f71d4b21544. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCAFS2100393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd9d5a3363f19ae20d806a176181f2c1c1f7f2a22647c3200f4f4bf893f09f9. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/TCAFS2100396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf196bc5d8e6715f5bad86f7b0a76e61f87f652a61f89a5204148bc5afca691c8. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TCAFS2100397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213e5440426039425210c776ab2bf3c99e66a0338c600c0795b3fee5b6ad1a9b. 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/TCAFS2100398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fb44de3cbe1779ff4c60d23ab1c777a2afe7abf3f212f3a4f6533649c0bc97. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/TCAFS2100401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc05a3d5c390c7f6e8f29ee9dd6b957c03cff3233ed147df86f56a2de4fc84b1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCAFS2100402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86cea04477b7e6385e47c357ae821eb90188e8c2c76ab27b69c39e2aba84304a. 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/TCAFQ2183090.