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 0xbaa97c4b06d8913533c9ea39fe935e9146ef75c9ddb456579a56d46da1fd8541. 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/5e5fabce-abf8-4ab0-b3a5-0b40eccca98b.json and https://artists.proofprofile.net/proofs/artist/5e5fabce-abf8-4ab0-b3a5-0b40eccca98b.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 0xbe6f7ef930cd2c21b545ee933def5c43620bf737efd95384ea2f7ee50396cf67. 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/DEZ650512167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e3d8967cb76f98f0bd0d0bb703237e84081be3a85076c574b223cb2878f473. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/DEZ650607365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43d9dbb8be4878b7441f54b10facb2a98c4320ed88e42ce711e223dc0567577. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEZ650607367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e4a0f7b0c0c9fd5670445129f308945a212a2e03986cf0a29162a395654557. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DEZ650607369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ef149b72ae1d44f2ed4d27d4d4fe92598dc73948534a5220e65de36bfaf2fd. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/DEZ650607370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f338a6eadc1c2821f41068630b19f9a62f1bf130a3d5ae3207bf9b70097b1d. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/DEZ650607378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f78215b0c76693aff7eb9a0b8678efa390d6db4d348a072b027471f2a2bfcae. Chain 2 (Bitcoin): anchored in block 957608 (2026-07-11T21:00:50Z), 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/DEZ650512144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c7f3c0fd046db0a563836f7821b164853fbd42d80e2c765971229cc4aa19c4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/DEND11020401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c8216d7250074156e7a338aa6b2474e739611907798a6e802e05184be300b2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEND11020413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031052125dc509200a8090cd84d3a074a7fb993c4cd4b0f7e8c55441cd36ef3a. 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/DEND11926104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511ab00f308827f0de9f7868bb6160c8878451002e1321c2ea27bd9bccbe0c7f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEND11926110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf775400b0d01f49c0b41724b425ab4bd734f04a76459502295808c1b038c7c6a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/DEND11926112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84d50e0656e89d381896a57e03aea8355728536aaeef19308e9576dcd1b824a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DEZT52400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca381f7169b0c97ca9ac9646f2721b66742a61a4b2b07a0b127403df3017415b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEZT52400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7080f640311fa194d123c63e3ec86d2ef01721a2b34595d5078d7204bcedb510. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEZT52400020.