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 0x8bf5941d686a8ae5bb050958251530779b538305dae0b98119e5141f4e9a080d. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f17eec7d-41d4-4d96-a9f0-dede9e39ff6a.json and https://artists.proofprofile.net/proofs/artist/f17eec7d-41d4-4d96-a9f0-dede9e39ff6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xc892c29797061d58abee666b5c6df47f2b1b091d6eabda24f55fdfa6fc30fb0b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRD1Q2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c386cf1302588f5ac5f7f8177bee462538fa45db7589b95e3ce8255dee43f50. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FRD1Q2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720c739052b66a5d40ce2cc6c746b056e7c79f01ccc02a1248a916c400351d38. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/FRD1Q2200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f358b037c6925eb635fd9dead494ee64f6a6303ac35a76a317a3eaf3c85b6d. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FRD1Q2200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2128e701c726e0e478d1996ff28d6891cfef1e4775ee2647f4ca43270a07fdd7. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FRD1Q2200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f99ff7c6ca2113c153233232f44422ca85617f7c10f3ff7b3c320663587a64. 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/FRD1Q2200060.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2299b25415067953d74a03817542e210c6b8f0c275e7d20d2375765af2ac4202. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRD1Q2200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9aafab2fb4931d018def938d72fa1ee3ccb13c67e4924bc16ff24efae8ab7e. 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/FRD1Q2200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64de30f01d9144373b7440d9fae10aef268f86db9578c6b7f4168cbb69f0dbb5. 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/FRD1Q2200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd576567d7542332f096c45381b728f6b19b25f012a69fe39148fa081df1e57e7. 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/FRD1Q2200100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f0b795385514b48830e06365f1efe07b467df373f7d64c67536b69821abf0a. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FRD1Q2200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154feee696c95c8e529efe9928888c8c45e39be4f04690b15927bbb5b4e7c5a1. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR2X41992075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf41b2a5bbc5dba4f6bc77707937814eeb1665490b312deb56a6176efe043648. 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/FR2X41992077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720c739052b66a5d40ce2cc6c746b056e7c79f01ccc02a1248a916c400351d38. 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/FRD1Q2200040.