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 0x35d12f16d9dd64b32da51e8bfa95f42475320596b6ae0024e186bc36105a1f02. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d79d2950-2cef-40e0-84ca-ca42e70c3fdd.json and https://artists.proofprofile.net/proofs/artist/d79d2950-2cef-40e0-84ca-ca42e70c3fdd.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 0x545c732c0b23333a3f82c1f61b78e66c5f158389d18343cd88e3fd419eff7fff. 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/QZTAZ2301893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb66763cf4cc767310e27902664239118ab940a792c7056c48b9fde9b5a1fef. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZTAZ2301894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ede16af40df27029f326a5007ed5050aaa20c836552efc4e44dc37f2d1dc06. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZHN72222978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf6b15c131d383b64aa9ec8aa1cce8df966bf3fcf1efa4a1218b7b15b4b1b19. 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/QZTAZ2301895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6365c1220e1b608ed345b4422158bc934b6934f04c1b66c56dd64208e1733fe. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZES52296387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca213dad0e5fad9eaf8a6a1c216cb54d42d84f7031b63e0dd75ff32657c36751. 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/QZTAZ2301896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279cf9dcef5cbacbf59874ba2b49feec3fcd73036852e1e10ee932b89e184a7b. 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/QZDA62395648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287b1d5d38a94d5ca99469584effa3541b91a2d1b5b5ccb54b69ae19611df448. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZRP52366709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305161632c687a1763073b367719891bf380a2575d09f50b4601a2da4972d175. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZFXE1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccaf6567c4446bbbff28997eecd131331352e19f7b01573f245206ec16512fc0. 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/QZFXE1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738fb5e7f9d3a67f7ff924958421ab32da5533fad5d68cba3b32d3f91125489d. 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/QZFXE1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cf0be87b76bcdd6d6695b44289309cd7c33fc7079eeadc591a11275c594418. 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/QZFXE1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1ad25d917bbbd6d2ab69e44247b7925d65a2b6dfb4d273f1f652cd379f92b0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFXE1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b59da0d727c72a64e1a59d28dd94243dd7ff12b1f3a19083aba419fa27e14c8. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZFXE1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb98584d0f2333e8d3c743be01e08752867eecb68af38e01dd4498f1e4a7a91e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZFXE1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d429c6ae1399d0040e00fee2b3715bc2c952d3c7d4ab55504ecd367728afc90. 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/QZFXE1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce34a9cdf0eec550785f72646ca6adef737688bc9bcee8ccc03b96c42bd8126. 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/QZFXE1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b495583755e291395a3ab092e2e0bc16cbfc7a09e65e2a2e806f1b30bb3c60b. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZFXE1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ede16af40df27029f326a5007ed5050aaa20c836552efc4e44dc37f2d1dc06. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZHN72222978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6365c1220e1b608ed345b4422158bc934b6934f04c1b66c56dd64208e1733fe. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZES52296387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1ad25d917bbbd6d2ab69e44247b7925d65a2b6dfb4d273f1f652cd379f92b0. 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/QZFXE1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af401d397bbb04fb1878e512848e469675a9c8d8670baa507ccf049cc035ed3. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/USCGH1829199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd335cc832e0f64ff3c0ee1f2191c5257131b34f983b80cbc79b885f8867da0a9. 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/USCGJ1760850.