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 0x26f6d85afaca3f2964ba56cdc6ae02a36badd76ef87a61b7018f5554d51510c7. Chain 2 (Bitcoin): anchored in block 953954 (2026-06-16T14:18:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/255649a5-aabc-4a20-bde9-5f4fe178a7e7.json and https://artists.proofprofile.net/proofs/artist/255649a5-aabc-4a20-bde9-5f4fe178a7e7.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 0xe5199841deb6ade542ba46698abfb988101d12e81e1273ba006c2a90d32f73c0. 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/QT6E62504593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6fce61939ba3a4b3df1b90dbca47286736536a9e234bc99db30559263d1d09. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QT6E62501642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04796df9dd33bc56b27a4ecb02b5a15708064b3226ecfd8f9967ee3e18559253. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT6E62557976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dc4ac887010b342f2f143256b50488f8b888e5bdf8f09b1f1dbfb27e9f8d07. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QT6E62560962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f72e08fef9657b6717da2d925ca58fef621c535c9462c7f9fc8224ba323308d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT6E62558032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ca1e67287a0e76103ab9db36d9dddd1fca1deb671bddb7c5fd0797e4fb8220. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QT6E72523132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c71367c00d1846c43e6e83eb9e405258a7c0724cf163d2ae3fe53fc46676a3. 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/QT6E72520813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c324e04162c157db8dd2fa23fd79b60a02223be4b71d8fb9f1c13f288f98860. 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/QT6E72546010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2689e64a61d4d34fc83182056ac48e69ec529b6418c4041cbd0ebb31b13cbe84. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QT6E72543651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0fc63a1f89447993f44cbd6e9c79e2a38a53672cc51e92e6b08b1881f2fa92. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT6E72595056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f9d266b7701cf5232397bd4d18a7b7303fece702d60a530ad5dca84f9e934a. 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/QT6E72593169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c9f00545d83f818a256922008d66d4de78138014b049d8263896bf87dace12. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT6E72595035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb151b2e458635d599018d21c0aa793904804d84da70e9ba5aa4ec0c4439d996b. 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/QT6E82504190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43399c856ea4e4428c33ca0b0398166f03ac54239c4fc871ca14488f70ef2dcc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT6E82504174.