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 0x873dddf91810c817e0d45679a9b5308e72efecbed9aaf99e6576fb50d02a6232. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27d07a17-97f3-40d6-ad32-c530c26320a6.json and https://artists.proofprofile.net/proofs/artist/27d07a17-97f3-40d6-ad32-c530c26320a6.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 0xfb55f1db5c55a3ebbf071be370a86fba2f31a2529af423292a39f513e01d0073. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBQSE2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb799348380a847d290a5ab56f2371fbb9341aa9d690d5ea69789e0ccd17a8ff3. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBQSE2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed17893003629409e51d8849fcdef29891a19d5e2af9458e621eada490d922e. 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/GBQSE2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11514ac815366ea4c16636fd8736d1f0c5c6313c937ca3a794f2e61c7820468. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBQSE2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0b38f98fed589b43bd8610938c2bf75313db51f7482c11e0102d5eb6c28fef. 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/GBQSE2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899104ffaedbd28dee167d3abd96e0acc0b14e8026d64ae7150946e389edec09. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBQSE2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94dd5e4e3faaf7aad6c671c8f8a46690eefb181d854a675ba03982ef37fe8e7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBQSE2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb55f1db5c55a3ebbf071be370a86fba2f31a2529af423292a39f513e01d0073. 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/GBQSE2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99de8ecc7539b0fa1787e381c4816d00dd8d9889849e3cdd8a6f2b4cb6ff0aa. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBQSE2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb799348380a847d290a5ab56f2371fbb9341aa9d690d5ea69789e0ccd17a8ff3. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/GBQSE2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725d10ffb9e218126884ebf371aae1d6b1496199433c18d1f16e9e18f8ea3671. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBQSE2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed17893003629409e51d8849fcdef29891a19d5e2af9458e621eada490d922e. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBQSE2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27bfb016f60e05c0dc7adf398d77a2da4700c029d191f8ca9035fbe86afff65. 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/GBQSE2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa549f73dac5d21c7184745ad50497e99e83bb3f9830d888c6b71fa8816aa3d45. 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/GBQSE2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ff7a9fdc31917811266f72cc7373e7cfe5f9dc1ff93f2e592f67add00dd0bb. 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/GBQSE2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c6b0f60498ec99770240f32c370f186396c260492866e71644ee870383ced8. 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/GBQSE2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62fd8e5b58b0b43d394f41a5783322699b515b82f374ba21c991866ba4b7b0ee. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBQSE2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11514ac815366ea4c16636fd8736d1f0c5c6313c937ca3a794f2e61c7820468. 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/GBQSE2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf980de73a499a0eee51c918c9a54ce0f0d7e9208f2ab59ae481ff37ccab8ab21. 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/GBQSE2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899104ffaedbd28dee167d3abd96e0acc0b14e8026d64ae7150946e389edec09. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBQSE2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa382536bfa6161b135f7938b838351eb94af4ed7add6f1628320b45de8710d9d. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBQSE2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ff7a9fdc31917811266f72cc7373e7cfe5f9dc1ff93f2e592f67add00dd0bb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GBQSE2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x030bb2611a4a1a483f198b2948492a723846ff17958848d563843465fed0690d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/UKACT2520595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ac7ad19a00a5da14850f5893d9616f0dfacf0cb3a6b32b7fe64d8dce56df13. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GBQSE2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb55f1db5c55a3ebbf071be370a86fba2f31a2529af423292a39f513e01d0073. 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/GBQSE2300003.