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 0x4fd7b1b41925e4204e4e813fae798dfbeb28fcd42efab02ba9bd7a5a4d556340. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6ce8fe1-fe88-4faa-97a3-70444b523c4b.json and https://artists.proofprofile.net/proofs/artist/f6ce8fe1-fe88-4faa-97a3-70444b523c4b.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 0x291bdf49ea5883bd90ff684fa06c8ba2d1c4fc507e680226fb310f97c0be415a. 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/QZMEM2468757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6e13b2945efaf3409921f3c74ebd385a5175ca3c75517c80f7ccced5606b01. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZMEM2468102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97165b4b61850478266ecc907512c622095db2b2936acd3d7386bbd6640b3b5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZMEN2402690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d61dfa091f594b1148c1a78b577d1a759dfce7a5873161c40e87369190070e. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZMEN2408915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c367ee57c5a00fde55d1b251804ddba895ab7c78c525dd7f514ed7876173a4a. 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/QZES92367362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc6a09da46dbabe99836542c7e5ccb61a9a4ea43d22970a1b4aa7c4ac9bbccd. 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/QZES92367363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fffd7125c04b180bf57a9a05ae6e89738c7bce85f8988dea1199f9171a77506. 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/QZES92367364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1bb297011e06f77cbe30434aa8cdc9c989fe48b05169655fc77b51666bbd14. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZES92367365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82dd2cc1ff725a3fd78db0a72e15d23521137c415cbcb9c590912b1573299552. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZES92367366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8d52cb2131d2b48f42845cd4d8f842f4366e71cebb6b5e5f302bed1233a468. 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/QZES92367367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e3f4b9159a87c58f8830ce16d8f7ba0015b93754f8028021a2e3a6cf519f4e. 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/QZTB32417344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56cfd9627267e3ec6d5d0dc111e806ce8b8f8d532283b6dd0cf94ee0d79e2f0. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZTB32419296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c72898e2d5ecce7c578330c804a0bc69de707deaece39bf1d655260448f7686. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTB32419297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a5bc434362cd9f950258bd78da37ca79000de043fba451609238dfa59996e9. 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/QZTB32419298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77c5247b4794d6a07e8cf1cb6ee7bf56af7e868cf7a7345860c6945aee4cbe1. 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/QZTB32480149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a681d9b2ba52a9ca60e6fdee851381ae1eba459cc7a0e49bd479345fc6fedd4. 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/QZNWQ2435700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6300482c7702453479bfd22815c9649097a9b205f7dc3db60367f71f256157e9. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWQ2437280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8459c1f2e180e5d62534c4588755694d09c873edadc81db73d043dd4faeb92b. 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/QZNJZ2519828.