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 0x7f1bf83a8c4106ca1d353b6ad7a090a1f33c4c85b49f653a06e1c7846906059b. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4a070c3-a275-41c8-b2bb-b49881b5e4f2.json and https://artists.proofprofile.net/proofs/artist/b4a070c3-a275-41c8-b2bb-b49881b5e4f2.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 0x7fe5ff8092839b742218318a349d88a5bc38290f09ea6eeeebc3cd80d04e732b. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZK6N2031772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243d7ca37f7aa2b634758727721f1089b051285145a4ebe88a39cb264a36efaa. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6F2121877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c291d40e5ca98c495f97b0fe501fe344928ca32e224a3ac6ead257f2b16043. 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/US38Y2411487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf294975f8d7ccd39c5435f5e943070c22591b6b5415ed6582d50f37489b018aa. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US38Y2409280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff22f254691e6a40ec2b9acef40ac02dec45984cbbd988b0d1238c6bad70ef9. 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/US38Y2405808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b1d545a29945c9de8c7c41f97c326c661f9e1127f245023290180bcdd1f438. 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/US38Y2401352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aab360e485e89e3e20f745aea1424ff0cb8b262a89a6d36c182b4ed76249f73. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN92400682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff698a24d9537c64feb5a265d8b85608be54a3bd48afb9fb4d81bd4f3aee332. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTAY2317212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1051911ee3543adfc3e876bb819fd1055c7ba97b820d6a3637ac273e15486d. 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/QZK6M2296247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb93275fb16869fdbcb1c626470f952ef7461acc5b89a1560a1a56944bd55d99. 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/QZK6M2296248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff22f254691e6a40ec2b9acef40ac02dec45984cbbd988b0d1238c6bad70ef9. 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/US38Y2405808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b1d545a29945c9de8c7c41f97c326c661f9e1127f245023290180bcdd1f438. 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/US38Y2401352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6c41da4c056e78bac943990c623a95533a92dafc7df959953e3ca3be7a01e5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM24S2308389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658eeb8cc72829243bae3d5022a073c3fb4bc29506412ca963b2a25a65dbe342. 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/QM24S2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab21e5cd107ec06623e10c394a59f30a4dc7fde2c9e7a58ce6df155ea3dc5bb5. 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/QM24S2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdece1d17144f03f95b1416a7a5247e6fcd67d4764c9811b4952f5cd5b861c2fc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM24S2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdfd084976df77d98671e49a4a348cb5a1085ee84ac93a4a52ec6ec980d9b4b. 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/QM24S2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435c331aba240dd9a8cf0d50b5ae1f413707987a9e2dfd7d5018c0de22ba0a9b. 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/QM24S2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6c41da4c056e78bac943990c623a95533a92dafc7df959953e3ca3be7a01e5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM24S2308389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cee19c52ae89b7d288aa9d39b3df9816fd187e3f44d2b80be1cb127d184c0e2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA2P2330707.