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 0x1b20ae0489a55cdd18baac73ec7f3d7b21460f1be5889d7c43b0cb0f4c72d40a. Chain 2 (Bitcoin): anchored in block 954063 (2026-06-17T07:49:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/46b0a0c2-c30b-4395-8c9a-f5ea34cf836e.json and https://artists.proofprofile.net/proofs/artist/46b0a0c2-c30b-4395-8c9a-f5ea34cf836e.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 0x874429c718c681f750d44a15c68e0a37dccc84013d4e53782dcc52fe6f982eaa. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOHTR1802010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8601f4dd66fade4dd371bf84da013a67930c15384055dc82829ae4a4aecd569c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NOHTR1803010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57357bc5bd7e88091d1f4fd72d0d457394365ba0851a4ba19882993e45f02dac. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NOHTR1619010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fad0a63cf5c2645ad507472f1dcd82418e10474a323db507f70ac230ca3ac49. 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/NOHTR1710010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1292ee55f7013985c5a5889f42a1886116c5363a8b33d4e07d94743b11a826. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOHTR1702010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b72b82c95dd9d9f31c502cc6c1c0f7e81df3b53081ca4f0320c7b30d950125. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOHTR1916010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c5e12ff1026490d93276e3dabde06a58a97f90566b98e9c3e8df9a6f1777fd. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NOHTR1506010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa168eda8cce6e91bde5e9a0d0968eebe564f77e238c7912d27caeb6db3e0c5ba. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NOHTR1506030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c229559f6cc425a05ff1af05fd4fb8771d6d237d825586e122f6fd7e70dd2ba. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NO2V41501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916ee1c8783070314a01abd52b3ca2345f3857461c79781a191b5b8f9203616f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCACA1437918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbde83e0630a03d83dbd71fcbbc69e0adf8a4cf089c66579dd829fece0218745. 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/TCACA1437919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e4800a6d2bfcc1579cb0fa4e369c03de9ea61243102f7df8361a9a34443fa6. 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/TCACA1437920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6c8e55f96ef79bbc7e2fd0404610e36d85a7d5492bcb5bdaac73272b1c8671. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCABZ1426789.