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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 0xb179d67191114b8db31102184930cd93fac93aa08c1f133d3f5e4142e14042bf. 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/7d4ede23-74da-4cb4-9bae-904292052c2b.json and https://artists.proofprofile.net/proofs/artist/7d4ede23-74da-4cb4-9bae-904292052c2b.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 0x70cae21a14eb74501ec9491a8e8ba909f59814de054da5cf53bcac452998d022. 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/QZNB82007527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf6707b06ff7a43d9d40f0a2969b4273996618f0506ccb652983cefa608d71a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZMER2149784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf6707b06ff7a43d9d40f0a2969b4273996618f0506ccb652983cefa608d71a. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZMER2149784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491a5c35b9ef69381b33fac57ce4e79289513e1142808fc3d1c6ae0fa566d6b1. 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/QZFZ22280602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4724fe6a96d7be919f500fbfb07f969332717cd8de5bba3e7518f92169b6d82b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ22280604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20fb03416e96311c5567a561558bf0cff3bd74ff81478b14b66a5a5a1c16f063. 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/QZNWS2182612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7fef79e6ed02c1e98820810cfe7d1c1e9046e737b71de7087f44df278178c9. 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/QZFZ22280606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f69515f955263a6f669e135ba1a4676f352f6e7ebd960dfff8138a9f03e4c3. 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/QZFZ22280608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9913b485ba57eaf8b9080c6036edd5ff0f71d71bee9ab96b0e5ed1de25a4430. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZWFU2427680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4106634e8ac50f6b4a260e7a1dc318f8e6b312290a4d2b8409f7d2980215800c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZZ762482441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140d01f73f254304175ee11537df6e9e2083a089cf9e7835a106b33cce3c5361. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ762464322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8fd4e4df4793479c4baeacac8120cfe0d7e7bbbb6ea18f8c07aa09d3764300. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QT3EZ2455208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb64a4eb0e74d2dd3044cfe5b3ace5037e442b309ff37c6c4093d45d80fd35cf. 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/QZK6Q2596192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec14d884284eaf7135a535029f2bc581c5cfa1812695d78d378d8377d58d8994. 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/QZK6P2563269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f0b6aac767aa7bb0f2f128d29619ebe92261b7696faa52e1a2649f2cd53460. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZK6K2567203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb0374674c1a33d0ceae46c8773ae9e5d95634e0f8b1d34db88e3e25c58903e. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZRP52504403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93152cbf22fae122934ada11cd006e26adbbae9626ae222d07e67812eb7a2ff. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZK6P2563285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278c6ba82926e918034443954bec89d4b7221bf21e71de74aef18b8e49233fcb. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZRP42586911.