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 0xd4ff44a280a251b22a6fe3b154330277fc2e48d383648a5ed0082a2e3599f7ee. 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/2e27e6f2-c07a-4249-86d2-7d4083ca6f18.json and https://artists.proofprofile.net/proofs/artist/2e27e6f2-c07a-4249-86d2-7d4083ca6f18.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 0x10e7f7d95220b35dabbd04c2b080944115fd224f6d3db3b70993c4e5862b399c. 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/QZTB42420995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452b6375ad316e70efa6aefc47c49f87b3309edc538a22c2cb92d3686d537ef7. 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/QZTB32484731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69abdf3a74170b7be0fd2796e779b587d147385fac53e2f0d379326248184ff4. 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/QZTB32484732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9942c24b65606a0ef418611b1b2eb7be21da9911c2598360e7b2897ec78912e9. 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/QZTB32484735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabdd2efc2714d7f4a0439e5341d35d2d03b5254b3b64082fb89cc52d3fa757c. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZTB32484737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd56b4cfa2007daedbcea162746da29e443e6b5323838ff56f4e26cc1fcd663. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QZTB32484739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a420614ee60ec39dfd1c34ff02f56ec958117f69b5c9f5cb1065a878f78de2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZFYY2527284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d8ead4fd27bd5964f2982fef1c488bdaa79838b0d926dbe47a324f533038ff. 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/QZFYY2527285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae238cc4735f25136f906d3a4c3ce4ff8c2a62b902f0b5686030fd750c9a424. 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/QZFYY2527286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7442dffe6f98cbb87d9e82f153d1bd867bb11a2fc397e0f6f46b3553e1fc13a. 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/QZFYY2527287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe554f5948f1580855083b65a3f67ca51c4acc9b3e5157546b98e13f4b866a8. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZFYY2527292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa380f5865da49b42c5005abcea11edc8d3bcf32fe67e39ad7120c443581fb27a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFYY2527294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e672f693ad6530cd29bb72c112ba1d544386860a0200c9b9e78dbf30d81f28b. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTBA2552199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22765b3e4302b2bdcfaa080869804b6c9bb290f7168b97f9400e2f3408a166ec. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTBA2552210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9221d5b2abf6e5fb74676f1ef00b5d96e0843004c4867bbd78cc140c9a6d5771. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTBA2552213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599b56df7e66cc446d1065c7be8e7e3c434abf5ebaad3dc41d0a91e7c7938f6f. 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/QZMEM2513633.