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 0x370214f39b9ffd4f9c1fa72d4194884eca51c3fa5dbeed390caa3d4b4d915a33. 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/302e15ff-4de8-435e-9e0b-db87655b12db.json and https://artists.proofprofile.net/proofs/artist/302e15ff-4de8-435e-9e0b-db87655b12db.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 0xdba4e1f9469c01f514cd67769a7bc264de327f278313daae3e61dc69c365f230. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/FIOV21800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36d81c9d95d25a281ac5f17bb4670e417a90346adfb3df1aed1f00db13c7969. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/FIOV21900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6538c3b100521463f0be553f10c4e2b88aca16eeb152d723224d64721f826b22. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FIOV21900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a6f4b70cf86f2e577e78ecbf736a7c12e82e21ed6c79b693314199caa379d4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FIOV22000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7927544d251602101ed93977d4f968344a0aa088fe490fba578bcab9a24598a. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/FIOV22100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f58b006f601fea0b7119ba3a6ac51aa40473eda315996b48342847b5ac0bb9d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FIOV22000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812cd89647f73de7fa31101370f3948c0538b776b502ff84449eed1b8d69926b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/FIOV22100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa154e54a8facd6524c90747f6c05ef0ae67e083251110e04e6759bd8dd6884c7. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/FIOV22100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431731b3103899630814eb84dd15662a72e850ac3c9bf59aa5bb3bbd17ada3a8. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/FIOV22100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5f92605cc2ca3a56b0069afa6d9ed9267fb83ac2732bc48f2f34550477902f. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FIOV22400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1529fb3cba31d471df31a8c476af620be01cc9beefc762b1b197c141e5e756e3. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/FIOV22300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65279161c3db5ce13173a8aacbcc00a234e22d5a1bde9ca48d5a298e8ba920c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FIOV22400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49564c5168bbdf7272915a61d5f6ebe709e623a3e8ab44486bb5e6ebf46390c5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FIOV22400001.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c966409912b881d979a94d8d049622f9e6b292fe867daa50703c95634efad0. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/FITCR2100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f44383dfafc9b3b6056b2f8a721118e32c31e591a87d64e13875c2e9a1a5527. 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/FIBAR2000037.