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 0x9649f4b98be020ec5b4c466647d287b68cbbf35bfb41ed8958cbcca57ac9e558. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c8aef7a-9001-477d-91d6-234674b6ed89.json and https://artists.proofprofile.net/proofs/artist/0c8aef7a-9001-477d-91d6-234674b6ed89.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 0xc64d20f85df0bf02fa568f3bcd71892486896bbfae2ff9599bcadaf25b86f315. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZTV32424773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf998d848f4787ed505287bf1c558ada71fc5c71936c17e4ec7962ee2ece5fe96. 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/DEG932400534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a7bcd071f695dfb2cbb9ee2f3e472c62f7e551d121b2ea8dac1a230b8beefa. 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/QZWV32331452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6432fe0abe441cfc314934e0a6bea5dc36a5e4c19648f2296f4cf8c8701406e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEG932300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ad8e8e2b3610b4d4f7ce5e0d513afb4613783eee750d552d39a09e82c899ba. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZWDD2293124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9e8a3c3cd4260e87337cd6018cab92a14e30a6f34b12caeb58a743e8351dac. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/GBWUL2221337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2544fcad79b188c930e15f1dbe3d234d4d05d60bbf1a39eb4f0e77c487eda4bf. 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/FR48Z2200055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d1341f6a1d578439acd85f81cd73cb3fda32afd864c0c2dfa305f10b6514d0. 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/GBKQU2234847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5982b1d3ea3b8e6a8cc0bfa35c2cbc25fc52584eb9af398d587fd1ddc5949a. 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/GBKQU2231347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5fedf2c536a6b63e55eedcc847a31e69ac65ec77e73ff7727e7f5c99cb39d6. 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/DEG932200384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b4ad25608026d8a80c2f8cd0ef9da3e8bb0a6abebf6f0e228d8c896f9174a5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEG932200385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8656385db068c4ad778a86ef300fb9aec454287e9cc86dd33c6a14bd78b1d4f0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QMDA72169992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b0a1c4f2c6871b8214c34e231b70511c673221648330dc0111ebc2fa8d6764. 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/QZ5FN2149636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabf781ddcf46269616e3f64bdb78bbd8299e8d6b7919f2cc072ed36fc10dc0a. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/GBKQU2502215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfafb815c62dbcdfb9df7b545e27c5a2d9cdc7862427557c9685416cb066631. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBKQU2502216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbf215c97749856caa6503ec0ea150a401513fb19a14bb893393ddb4cd6d627. 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/QZZEC2470168.