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 0x3e94cf27280679077bab3c19ca4141035373095e5a97b41dbc67eaef4fa6dfe1. 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/f993f74a-34b2-4441-aed2-4a02286f74f2.json and https://artists.proofprofile.net/proofs/artist/f993f74a-34b2-4441-aed2-4a02286f74f2.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 0xaf2cea1bb1d8fdf0480eb6ad7666ac137c16922a7e979a1af5d8dffa363b3fab. 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/GB2DY2200182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fc0258e1323d0a306aadd988c36265d8ab122772121cb59aea50d332916cf1. 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/GB2DY2000268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dea6ce0a41a51219396b660bf484204dc4b3f8f98593090af37ee03e8492998. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMZ92462244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b20dad2c40529013152f204e6e956a874dcd34522971d5cf2998e008b58be6b. 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/QZNJX2452387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dea6ce0a41a51219396b660bf484204dc4b3f8f98593090af37ee03e8492998. 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/QZMZ92462244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851659c702f0d633b77a1fdd9d56f2775b3e93de47571fa0c01c7aaea1cef2f2. 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/QZNJX2460556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380974f5d3de46f976231196663510fc51ec4f5ee9fd0f3e855f57932ff57f3e. 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/QZNJX2460584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3dd59bf18a8d65460bb7e23a3b0171a19f9fd0421c5b4b9246679f38f890b51. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZNJZ2488372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ceb9e59689ec538d3c0620aff034c82b3a93fdf84698eec97bceaa7ac8d605. 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/QZTPX2403113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78aa1222b275b7f6fc7cd45d8a3c998a5c27faaf98fd6762d656d5303489a95d. 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/QZTPX2408209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa39cd763697d5ec4f59753bb5c9ab5a63761bdba33e3923c6cf252dadf8151. 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/QZNJW2431044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d68cdb811ff7959e863cbe1cc63655c267f3318b2f1d5835cc8470bfff8e101. 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/QZMZ92448269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b17f922740436733fba508d2521e7d8c02b883aaa6afc4cef1fa6fada177a41. 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/QZNJX2420858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71f9dbfc51b6429afc8d105e0dbc6ff9cfbc6690a5d7fd6ee8279491f586477. 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/QZMZ92479592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa39cd763697d5ec4f59753bb5c9ab5a63761bdba33e3923c6cf252dadf8151. 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/QZNJW2431044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8314f51efb8a090393133991b8544e40cfb2dd60594a915442cfad81b55feb50. 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/QZTVM2447004.