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 0x740441a6aa9dae743e678ffc5328d343361801996b4335547858d60a82049f64. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb67df9f-ec81-457d-ae40-71e6eb7428d7.json and https://artists.proofprofile.net/proofs/artist/cb67df9f-ec81-457d-ae40-71e6eb7428d7.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 0x2016766457295c355af8880388c09bf0d7dfa01e35fe5bf766b8690ab85185c0. 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/QZDQH2414242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa2b34620ef838e4fde03fc528b7792b17ceb845eb598c4636652cba166fa00. 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/QZDQH2395819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce07cb8d82122e3ec6927e74e4c1700576aca3729c4d9981cec648210a10e227. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZDQH2393015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e88825aca8085995392f6d9d4f3561c6d3b3ae2f0f1b5b6b5ec9b20450d7574. 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/QZDQH2372420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4031b7c90cbdfc549f6ba752d52aef8f67f03afc6c697d56d7b3789f6aadc5. 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/QZDQH2367912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff8d290b7fd4e577dfb53a4c399566bea72f13cd4a160ea1d9f4bbff2f13236. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZDQH2367915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d2babbb0f99f7b8f296172d62c9ad7a3c9cf9c01c4de2a029b81ae16b5ca49. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDQH2367917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86158ded8761c5f3ffa565c462d48c8dbaecaad80600fa9925f9bb728096528. 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/QZDQH2366579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d21738ee027d1732ae066feac2bd93650613038ec23cdd5e5b7d0070803ced. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZTAY2410011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb5b19cade50514d0e08748a50b9f7b3d546e8a578d125da6ccd1aae554d328. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZTAS2422993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8790f74dfd48c81f5ca1d225e1d112b980f101cf425b41cdc2d172a4a48532b9. 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/QZTAY2410012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c56199c45c5c271548aa7a2684e08a2d9434ebb2e42ba4f9bde75065fbf770. 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/QZTAY2410013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f98b7658bb33e0b03f64390b5b75b9e635acf3ffa173e8ec685449a1348c32. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZTAY2410014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cf439fbbd9121ded6cabdb120eabd15554581a6550db7a08f9d044c8a6414b. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZTAY2410015.