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 0xbe1abda3dcc5d2c06b78c1486262139fae48146f9f7292cf009916ca12a2dd3c. 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/fca17bfb-a68c-41da-b059-72487ddbc02b.json and https://artists.proofprofile.net/proofs/artist/fca17bfb-a68c-41da-b059-72487ddbc02b.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 0x2e1563e44aae412738960a1cb124cb9b6e9cd59b57d642be48906751e8120808. 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/SGW502387246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae59da5b51933b122c315e22ad358e4ebbe23e1a3131679f4d66504f852cdf7. 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/BCA2A2300243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e69b27643d8e4390c8bcba667f25ce7e0a26b7e95540dcd3e22631a752b76f. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ESA112310202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f974310365e13cce892df95a66d665416df6aaeeb88eba6e8901e72ca9a3cb. 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/SGB502365314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db1dd4bb18425889930edbc0d08d3978482f22e8b25fc3b89299d7678dd404d. 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/GBRKQ2534999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fc5cc884d477d781ef455ddc16cbab7bc9605e22476f570c654bb8695af66f. 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/BX4IU2418849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27526cf7442cd117698c792456fa3ac4b3fd43685b3d6cb7be2f32bd475b4073. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZGLM2589028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5875edd2be01d3acb790e4226104ec8fa66ea8549cfbd4d956585ab09a325a42. 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/QZTPX2449025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea54ba1d636e7dcff461ef1f407c4970c7e7407a821cc3432c9264ed4ff87dd. 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/US7VG2571682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4916c5015b49305a269ad802df7534c12cb27c064ce1a2e1d4293287fc937ed. 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/GXF9Q2410378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7dfd4d75048be327cd8fe331411b3c75e0ff9815dcbf983dc90a0dc76770cf5. 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/QZNJY2441816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6378b494cb6790e37de3ac7bf7c06d7e1395e557e7d7db43c7d7e3c9f05e02dc. 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/QZNJV2408867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f90642bde38ab74698f9538049f415a1055adfc8cae23e67c442af8769d7ae. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BX4IU2343575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e78cd195233f224bb9adb01bfc897b93115642fe9a0809dcd8e38851070f4c. 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/BCA2A2300245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6c3b3127122a71acde7434821c04a4282155b48a425b96c954da5b6744d6dd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ESA112313858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7b690d4e541716b1f1acee09c4998360d8f8d9ca141776757c4b5017e93f55. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXIV82327133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6622eb11374bb719024fce777b1f3b4196b91b75558bf04bdaef1af550a1ec9. 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/ESA112310191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c9a9fc252fc3f7b1bbc2e00d0eb7cfee41f896532441f038b7dfe86e9e4436. 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/QZNJW2409201.