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 0x63b668632ba6743c534fcd34f0572f00aae343d8841da23547c9027260719dee. 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/a13d7742-51b9-4f20-9758-8f1a4cd9d70a.json and https://artists.proofprofile.net/proofs/artist/a13d7742-51b9-4f20-9758-8f1a4cd9d70a.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 0x0ed84dc28ab6edb0f4017533ad60dec6c0400283cb745347d12744869c60b6c7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USHM91757231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3870fc35a0fb856027418db8c91c8b76b7959c657d58d75105305569cc772e. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USHM91757232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e25745cd6a5e86014a49efe7b79c2ffdad4e437b5fa68f9860708ba4dbbf9a6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USHM91757233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a763fe0a18b559c7b6dd345aadc168eb0f77e677d2a3e15592e9581786dd2c. 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/USHM91757234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a79f07c3819e00a411c9d86888f179ed98627ac61304c563df6862ad801ed4. 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/USHM91757235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc781a29d491917598fbae91523514055c857e020eef28704b3b2e18d76aa8b96. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USHM91757236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97229cd57066b3a1d87452ad6bf7c0ada756824cc1a63acc64bf4d72ea8add05. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USHM91757239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2f1c980fa4723cf4a9588023964852ac527e9b4ad75f8196809e9fd6b0d535. 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/USHM91757240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c5ead4f6ba535f72ffc177bfeee19f50db323ca01fa726b02d3a6ab1f122cc. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USHM91757242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528b45e62e5f745b4ffc72beeb1f67a890f77cb0a73afac49461e530a0e296ab. 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/USHM91757249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e0b50b00150ee64e14414312b748854b875110900e9c8e01d5d143cecaa233. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/USHM91757258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa764ac871e372436239c73a1017d1903347faf37f497c3d1b52d6c95ec201ab7. 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/USHM91757261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1547422863a823a5b4baced96bf4c7315bb99475ffe22fd134c98001f7940cb5. 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/USHM91757265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ab27ba167773f0d5de4351d112f9e97cc92ff0327aef71956f48530dd85837. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USL4Q1702523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaae415055c0cbb5103bb5c4449a79bcf535f8ddaf7fd40bef7a4dbfff60cd47. 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/QMBZ91757995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda8e037ad8db1988164670b1577ff47f5d474aa1156623daf193f68a3161790. 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/QZK6Q1958886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cc7ea12c5ccd3f95b38d1dac8dc0e495d8ae4eba6a4628eacfc332a95f2e15. 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/QZK6Q1958888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26347bb617261c579a08dead092ba0c5ed72aecbe473c56068de927a101d0c8f. 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/QZES51970633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46de6e0c0c5ac2ed391eb0c932213cd59c7d6260ac4cf954e7f09e6a0323fb1c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHN32031113.