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 0x453823484b029a2aea81a1e768f09910f1f4b046b126fb72665ab3d543ea075a. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c45b73f8-bd95-4bfa-ade4-3d298ecdc75f.json and https://artists.proofprofile.net/proofs/artist/c45b73f8-bd95-4bfa-ade4-3d298ecdc75f.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 0xb829c7ecea24188e3fbdccdf24de2a1f63b68accdd39943b28fedc865e4c39ea. 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/QZW9M2420765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8a52eac5317ff2383c52e4b8fd80989378c19149bb333dfc1a49186abcaa4b. 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/BC6M22422231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf20b5b6c0740b10ce2db093f2fc2439cabfe6a46760b7eeb138b2ed82b21ff9. 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/QZNJZ2409167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5450595ad119f23466397dd4506e68c5e71163190a786e2ba604a17ddc1a181a. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/BXIV82493198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945306d48c5a8d0aca2b3d72a3b6509d4af9faf7ce55c9ba02f432345b2ba004. 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/BXIV82499187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0a5a542af6fdac8f913254308ff5813b4a8d9795a613971e60b37f2ecbd31c. 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/QZW9L2357542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dfb5ebd70c5b0600c0d4cea7b41d987fa66e0e87465e2a4d14cb86fd201ae8. 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/QZNJY2352444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ddc2dff2eaf951ca68867d108994d254d3fdd8e3a847b68654963aeda29fba. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZNJY2354569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26c0ac85a38890d6aa80023ca3a5e4ec87fdcf62ac2af5a941d5cd59dbf4818. 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/BRSVB2501732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b89ec131277e386a7ebc70708a6c091457e5afb10722dbea91127f871af47c. 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/BRSVB2501733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6e90e55c0ed70d5a0332c38765e25eacb979f2af9895ef6275ec81637d0bdc. 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/BRSVB2501734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71793390680091a85d8c571f47828523e489b4050005454655629e72795a29bf. 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/BRSVB2501735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f7ce20b8774a7b49755f0c05c453124202c3ac5957b1e273e0dfbadb16774a. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BRSVB2501736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd5c387be081bac46be68b780af8aa682d0cf3e6314b03e5689fc6344802f38. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BRSVB2501737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a9df8953ee83c76a0119f2fe87d1083d8efdae7924ca317da23c05bbfc6420. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BRSVB2501738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa77a855cc88222b5ce7edc64e0a2dd5f0f6ba86a646624b02450af867d27501. 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/BRSVB2501739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cd2c065125e240964b595ffe2b5d452996db553c62ff5df46d93eb2e86af8d. 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/BRSVB2501740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef56662058d111acfc56b29e7f9f2912f3ec49dae5c2fa9e64eb9a41c2b01ce. 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/BRSVB2501741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab36d048975539b57ce6749eb0c70a315afae0078834afdfbc8c36796aba9b9d. 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/BRSVB2501743.