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 0x5046c2f5b9ca3d16c01b0003c5ea9cd074bbfacafac69fc52899b0a6b55eda0a. 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/8f460d1e-d420-4761-bf5d-b018f6f6dc62.json and https://artists.proofprofile.net/proofs/artist/8f460d1e-d420-4761-bf5d-b018f6f6dc62.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 0x1012d7d7353355018728c65cbb08e4ba702050fb214e687f96d77d3894b2a427. 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/QM4TX2562629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3661537f2bb7573eb1b630aa6032b4d382e098cbf3c2e26b654baf92cbdecb6b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2570397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57cf581f805620462c2ce41796db8ca14ea231dbca8097c2208c51437b29ea9. 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/QMFME2429119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400345d1dc2797d4d0a330260df3f4479da3e4f5c48d18a41d02fd5e172ab595. 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/QMDA72429313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3525af37dc515c73b7cfa67419a329c9acdb3afbca9b31b939c1af48cdff432. 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/QMDA62443304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a20f3caf7aab139c910c38acd60011bc9c481b6386f45b92f7a023fb4b22d5. 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/QMDA62408808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6b7d03c6ddc2987ed0c5fd2e0557c3dc9285e23a662feadd8671fd2994f0c1. 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/QMBZ92427626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4837a2db011661e8a6dccb0005be17abdfe89a84cd2473a45d846ed44f0a5d1. 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/QM7282446060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a18df16182ed758c58b435e2db9ab1f62cbaf057c72de85ac5782822383115b. 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/QM6P42482806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117114bb307a68cce784f36a6dad551181bb83e465638cb1b16f77df1efba968. 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/QM6P42416010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b37415e842f57700af31b60f496fce288218190e72386bb39a2fa1a6d68f855. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6N22426359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b174f70402c8d294391100fd804995c6257dfa65f38da545aa869f18e4c5f60. 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/SE5ZV2348101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712551b71f02e02570ef0c9efba3dee3de5068f86a03a81aced44e4ce4ec9c40. 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/SE5ZV2343801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc466312aaac7393bcdb8cbaa8c324e63a81695ff9c071a072045e80b9ccc5c7b. 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/SE5ZV2335801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c42cf509555e9454cac9546c482caef443212dbabd7b37a0cfb10fe96b4111. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/SE5ZV2332601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bb2f950dd300a30dcc318c89040803b96415f499d367523b79451ba220319f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE5ZV2329901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0daa08e3e781b99fe8915cdcf9a92f4a49b9f0eb9356491023dd687a4ff03bdc. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/SE5ZV2325801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5beb84529755bb8be1e739a05c1f3a80e57c607fce6b0210b4c373504d032d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SE5ZV2323201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8aabed57074fa3bd0b61abda5544648a6b04c3c7b5e4ae5526bf167f0511bd7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE5ZV2321401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef18694fde0282807e878e5f5df1efe07f66422853f7b8762e83e6d7d2670d0. Chain 2 (Bitcoin): anchored in block 957236 (2026-07-08T23:38:43Z), 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/QZHN62336770.