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 0x563af2b03ed707d8a5254428d770ef34f4f5b1dd6294805176848a749a9b4341. 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/61402304-7473-45c1-9b57-aec6e313d2cf.json and https://artists.proofprofile.net/proofs/artist/61402304-7473-45c1-9b57-aec6e313d2cf.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 0x4b92d7a9032c681604f2b523455609264d7e4bfb008bf8bda96de5f8b34fccc9. 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/BR4P51000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a1eb23a0930f42feaf4a01f8fdd33c8f39905825308dc00b20755eee23faf6. 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/BR4P51000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d584100d2df55fed7a601ef8f9be8a8a1e39249f0bba1a4e68bc94f7e0fbba. 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/BCVVE2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473666443d4fa3f10de1613c90393f430a36999f0654f854c82ae652fd498aa8. 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/BXLL21600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e9475214c4bd9960e399aea2bf6f43b238683f29dbe64dca510cb45a7fd492. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/BRTRB1200242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c5221ea566c52ed98bfe7a421b5bba651fbcc9573469b04db7dceac0e88384. 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/BC9M72100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b92d7a9032c681604f2b523455609264d7e4bfb008bf8bda96de5f8b34fccc9. 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/BR4P51000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5801872f097d757b0059428aef61357412c9c89bc35eca9b889bc73f4c5b56b. 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/BR4P51000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a1eb23a0930f42feaf4a01f8fdd33c8f39905825308dc00b20755eee23faf6. 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/BR4P51000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c0e6fc2bd1b70a6e8c4ee7d57aaabd00d9731f3b22c7ac7f49db43a1e8ff05. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/BR4P51000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e2a499d404e5e7e96dfe3aaff84e5398f09ec13254ea243ce31364c1949e51. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BR4P51000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5dfd7f7d718dca0bd7e3e56456a89935d2a3d6b1db9f8fe24686f27c08d06f6. 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/BR4P51000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8940ea87e40835e042898034c2fb37e83a73240dc5f94bcf8244d9bd52158853. 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/BR4P51300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55fe419314b30e780cef43cd14ea0e931ede2f50dba672b9bf3c9c072e6018c4. 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/BR4P51300013.