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 0x46c27f9d0bbd3979e23e181c909fe78292df4548d61fa3276de30bd9d2852107. 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/072a407a-74b4-48d3-b97c-df1e6aac1581.json and https://artists.proofprofile.net/proofs/artist/072a407a-74b4-48d3-b97c-df1e6aac1581.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 0x1d3aa66a62010995adaab479e175d5b6b3fdf3743852bd795e37eaa7a578a0fa. 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/QM4TW2599448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96054f40a200caad790c3c7b3b80efb0f6eadabc892a15884f50b63546d927f. 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/TCAIV2464357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816c6403e7a8aed0c4b2ee17b46b649fe8304a7c55dd8803568db52ab957ca16. 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/QMDA62249529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6748efdeea26a03f505e7cb0aa0d74510c2eee8cf3676cdec1733a6d221d6fbc. 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/QM4TW2357310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb840b50d3df8c43ccf444803d1b45747ff373d42409e185c01799394bba8b3. 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/USLZJ2140777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c9c2ff47bb2d8389d8688b6fcf3f5359f641bd50971f0fbfcf4b1f0dba3fed. 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/GBRKQ2030181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bde19d620c721525cfdeea2b2eba06dcca67c54b6d5a9d460fd80876ea0e76. 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/QM6MZ2541761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf66ba96e6accedbff4fec4dc46585354e206f308a1c2023149b8e6cafd4dc37. 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/QM7282533789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b2d36d267da4441e3830666028d738cb741f3c63d8e33dcdf8255abbb876dd. 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/QM6MZ2541755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e5882722bcb82068d10ec84cb95ab9e3cacf30195eefe31e764fae6c65e102. 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/QM6MZ2515032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0252684e902664195aa673ad9ed67f9a1dac752ec0c3e037e106da0ef34dd7c1. 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/QMFME2485422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da99639a5fa8ff4125fdf48dc769599a420be62f6750d3c1eb0f03cd88e54ff. 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/QM7282408576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77215b258d24dc0e9a21a608fa7e2fb17a2c64e002899de0244648efb9295d71. 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/QM6P42406733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816c6403e7a8aed0c4b2ee17b46b649fe8304a7c55dd8803568db52ab957ca16. 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/QMDA62249529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb840b50d3df8c43ccf444803d1b45747ff373d42409e185c01799394bba8b3. 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/USLZJ2140777.