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 0x3ef37f81179193305818f6a34114137d16c810bd077365cff8d37c58bf3b0575. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c200d162-9e8d-42cf-b9eb-b8720c09f1bc.json and https://artists.proofprofile.net/proofs/artist/c200d162-9e8d-42cf-b9eb-b8720c09f1bc.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 0x91663044b08bac2dd3203679514d5eb84422791f480ce832eb0276f47fba2795. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USLZJ2027077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66eefa087aa19058c784bdf4ad120bfa1338fb08f7fd7dd4182f156879623a6c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USLZJ2027082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1084c18574f5ebc286d0b9fc982eb43bb061cb550ca6c2a1d033d9d339b1db63. 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/QZFZ62449472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc2fc2738bb0416f701959def7d7fa152fba4bfe2b14e90425238463e15ad24. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZFZ22534849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b270d99ca728fd5be3a66acb59d3f5f896b43c281548928592bb14fc2587b85. 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/TCAFE2092529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c55db954d24ebe31693d52197e634c1dcb436e878554cc053c913e400e19ec4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZES82548343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2586bcfdb06c0c8ea2c4a9aa2460b8d4b7158dcee533ed4c003edbb39edecabc. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZES82548344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1789a3ddb1d52cc9a42c3fe9e19f23be6b75a326f4b8348c7612085f1fa858. 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/QZES82548345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4071058765d30502eed489ccbd3246082b0daa5ec9380cd0a63df46513d9d8. 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/QZES82548346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbebfd9aeb05c91442a19ea395a0d1362d4f3e886a79a8c82f6872774ac6bc0b. 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/QZES82548347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad002e5aa0fad0fc8284614784ae50f46e0d674d28087d23f7b57b09b88b635. 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/QZES82548348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf521855ecfb0aae97c7e57b7e095b904db56cc9df18c8076a847e06f41be1ffb. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZES82548349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615c07b73d5c0c06c727c5051582de7bd0ddfcfe44a44fed298e22c5e865d5f3. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZES82548350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832af965fa378b761eb4b2604ecce6208274ea2f9bd603c9430a6c9b5ac02437. 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/QZES82548351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcd923e6a114e4768054fed3e2bae1e80676842f1441e39c68a63695b70f5ef. 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/QZES82548352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0c5f9682ffd22722251633f566b0352643db8f9e15ad4eb83865c6438d37ef. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZES82548353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4935ecc75e920c72a679769b23273b55f44a5268b1007512296414fa9ee2481. 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/QZTB92283326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ab3e411ee361923ed9c39890ebc37d81130f5d1074946b71fd9448135039b7. 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/QZDA82160603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31628cc0669812727ae384adf3e4c822f1d8b4198dbf9b3aba8d723ce13cabc1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZHNB2155534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318a208b1b423da01420494ff625cec4e194f4fd96a100a7aaad66da3154d778. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZDA82161774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c49b46242b0a355e1f3ad1daae95b7d6b6583e6c5c8b3c2c1257cd59c7ca49c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZPLR2491509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bebfc665c388e872ab427bb5c6a3a908614a8c264eaa665be846f30db77fa4f. 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/QZHNB2059676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bcca8d6c1b11d15bdfad0952398f5f6ee6c578104ce732687e68a3eec6ce40. 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/QZK6P2156954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd7d9bb139de9f67564d6a22f7e6933163db3490ff7d473ecbd8badb5e776f1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZTB92300252.