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 0x831c9924b04e48a8a5022d1914c23b224384094a53da69726af9bea779319279. 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/be98ba02-077a-4841-98d0-67ed34892e08.json and https://artists.proofprofile.net/proofs/artist/be98ba02-077a-4841-98d0-67ed34892e08.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 0x1026b602e8e2477d576b438b9ede6ffeaca9acca07584937ad9631c1e0441581. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/DEAR41820074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9283d5138674e783a8772e734049d2e5c21f531a131c199e22d37c3d7929a8. 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/DEAR42040019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1884f4cf6c3d9f6772254d127756f9168990e0a0f0f6f24cdef0f1bf64853535. 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/DEAR42068200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba4ac640ae72529c019383e70502bd4b0c37d82be00eef2844699adb828ad49. 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/US83Z2215048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1170e7d96c0aed97238bc8eff6bde825fb71210cae7cdf787d7df24ca8d8d587. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US83Z2215047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fea1eb18668f44bf09102c7fd1e710c0dcff4ce463db079e1febb3000bdac08. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/US83Z2215045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfc2265e215353463c9a13fe383b3e70e0dee8a257d9ff59e4b6357fd001b2f. 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/US83Z2215044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a41805d9870775cb84ba49d9b027f2b72f5f4e10d8305a9832a961bac180b6. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US83Z2215049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5c8ed0daf7cc0f37c5dc2b08088e8d414d4d69871bd997e59f88991a92353a. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:32:17Z), 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/DEAR41925999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994e73e54a4e3220058077892b6f4cbb9f75563f8eb36edcae3fe4b16734b2e9. 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/DEAR41926992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb951b1dc826175ffb62fb40dbac2692a5ee981ed3d5e7d9a6e879d94a06ab7a. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/DEAR41985726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e8834ff5d4ea55679062408fb34b6fe3b8139ae9f5eebb85bd053822d8875f. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USCCW1611233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e89a9681ae82baa73dbb5ff16d0ed5fb9a0940bda838732c5333d549e042821. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USCCW1611234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83472a474d79987ceac969b824286ae60d801eb552c695e952d0925c3cf2147. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/US83Z2489168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42401d0a00e78ac325d8da91bc757180a3d8d72f97ea2bc5500f44ec2a8b08da. 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/UK8Q61500101.