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 0x282338ef1c9f1f1fc69031adb9cf4488c46d7b45cf1dd658982489fb33467212. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec43e410-ab0a-4012-a464-c913ef9325d3.json and https://artists.proofprofile.net/proofs/artist/ec43e410-ab0a-4012-a464-c913ef9325d3.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 0xb450e6ca6e7345e2fc44afff861d49b8c1cbce6d00052ff14124f60a69c7b11f. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZHNA2524224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd5ba1973309f10b6347b99669f4d590b4ec571c69d3e92cf895b45c7aad088. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHNA2524225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4068e5adf211b5be6f062f8a5238b7808890205badaa22ff1864d995111316f2. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHNA2524226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6165baa69f912ffb2c51f7bc69614b9943cf69c0ca0711c3f9765a0a21aa42c0. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHNA2524227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7063edc62d0967660498857f335b2f05472fac21b2a217c8d9420a91e61ae6b7. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZHNA2524228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2d87a4868451310030966ae82f5664bb2821beb188d6f1866398b9d91cadba. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHNA2524229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66aa56f17144c18a246a0e25abb9ccb221abdf9ff3a2a50da0d94baa74a2d180. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNA2524231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674b266d04ce31021249029b1a6464a9b5aed89d57b54b1268425bae2ca721bc. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHNA2524232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd2586646cc3f4d50287d5b647a7a67f093b3aa7e23028c9e8801cf1edfac8d. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZHNA2524233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb7a06ba5923aab0985e428f71640ca4fc46823617d946eca78f50bc605ea2e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNA2524234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba7f6727a24d30c1560fc6d0b13823240fa8ec31eb7efc1bf170d98dada2f6f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNA2524235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a12126b3d766f3044c395c6fe1b1e2bb2b44fc641b2e7a019232df26ecd760e. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHNA2524236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2a5423b8d126f441b9aec91965d25f94638513d5c1730fd8521a69d8378267. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZHNA2524237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9cc2d559288be281feea7c877d86ed425af8b0ded4bccea16455fcf3387e3f1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNA2524238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e71bec0326a4bf1daa549dfd3b420e1a73a618e7bada3ad3d1d2cbcff8326b3. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHNA2524239.