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 0x52115b630db7e96cb698c364eba6c88578545b296cc757332f0021f34089bad3. 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/974c300a-31fb-426c-8a2e-6157a5ba0200.json and https://artists.proofprofile.net/proofs/artist/974c300a-31fb-426c-8a2e-6157a5ba0200.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 0xb07a4528af3a4595eac3bbf8c585455c3629fa43360f032c5d28c90dc5d4c11d. 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/QT3F42443392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd1904e656679affae254cc3a2063e3a1199de7120f54ff79e7ba084152fcbe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTVM2225927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284141b45de8f2f8bfc8093ca58b88982955f56e567a087998196bcedeeda28d. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZNJX2447758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a588a6f144eb33d3a91f70ce96341a6ac28b23d68c0582a6f87a5320bc37bd. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZNJX2447624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de9a4bc57571c92cbf48649e3144866ffaf5f21b9c977bd19c74f99c8ebd27a. 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/QT3F42443439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0377cb99c86029208cf0a65cf1d76e52fd39d7685957dee08b7a416892dcd92d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNJX2451407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d76a83598fdeb00562370eae850a4b49e751f3b26e4311ec19cd884857bf10. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QT3F42443524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b68b08aaf057b4b59d2a4e20da4c57b980dd014733afd7dcfe9465e37ba43d. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZNJX2447746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f5646cc0106c885cd3c2b62da557116f2ec1bbce7574941c6a194726953936. 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/QZNJX2451403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68698652e848a4428e556760e3a3af02ca1248ba85810e3dfdbd793b01e156a. 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/QZNJX2447578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01fbe4e147390ade6830b5cac4909ad4b6174d6cd7297a5f64d4fdb6ba71075. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZNJZ2477306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f158d83a812838a73efa3719fda8f78c8e6e04ffc2edeb7c8353d4718b9014f. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QT3F42441076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39bd5c7a6be204e0a0976f7f333ed13dbcbfb1272d2a8f3506e7688d5abbf4be. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNJX2447740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13dd46db46dff8affb7e67229c48b13ec729c492b356b48858a6803abb1cb41. 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/QZNJX2447675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5230baf46da51e90a07115e22d8ce9d1fb7bfac9bdb216a80b99c7a6ec3a51e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US7VG2520061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05aebdeb850f632a84a06b7ef58c0e84f7f3f881f199103fac9d5dcef7037a0. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ22592918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ad0aed759e52c00b37c06c1777a734636747c09d7e4b4f392cd4e01097441d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZTB92511782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25740f4ac8de181b7996d9d6960414da2efa65e106bbfad4b7c570c7b2e5104c. 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/QZNJZ2551342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f858414696a419cbf06cdc0e0e334c935069cbff113ac806549955f1de841fc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT3EY2588283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3e2e61457905839120f62292db1d00d0a56dfbaa6e98478c80e17e0718f9be. 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/QZNJX2464991.