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 0x0915fd322cf1e50a0b1a24d12f74fa0fb83dca5b1f2b559d9f1b3332d1bb7369. 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/45939446-96c6-4a0c-945a-62e28f7d9f81.json and https://artists.proofprofile.net/proofs/artist/45939446-96c6-4a0c-945a-62e28f7d9f81.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 0xa3159aa5c4c0cf7856fae657868e7da54ae71c209b533f17db2fc8be33dc677b. 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/TFT202300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200868f92f2f1cb743e6dace7dbf4a97dc08a69c5521972fd3ccbf9c9600a278. 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/TFT202300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9077bd4b1cf3e25336e4d2f32049dc17763ab39560f8ea0bcf6b0e811df54281. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/TFT202300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d8f588ee271866964a76a18d360b3c6dc2b238c8c8019dd7ae022edd14479b. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZMHP2333605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4730984dbdabcc6c457fc251e11fd094cfac4fd7745afec71941864d16f19201. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FRDX62309130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140d9e286aa5bba4e6b83a1ab17936a468f7e10f535f33edf1035ad5ca2e9ab8. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZS652391962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d98cda2b877600f9a603fec6394aecf1d1f198a2abe43956cfd3a29cf0e50d. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/DEH742406710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f09c9ee6b2436f41219647c53cd270a17da1d436e6e9a753604a2ed8ebcf6c0. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/DEH742406711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497050df17bf867665a91064f4a8a788acf22af1c5e2a4b00446069f60bbfb46. 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/DEH742406712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bb8e4331fcc2ad191ca7d9ed0b7e2d929c3ffa1513d8e66c5ffca24c9ce01a. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QZH5E2439155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33aced4d4eb176f972152b2980fd41b7a8982e32a7dd4d785f08e4250d17eb24. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZH5E2439154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f729a1bae88de352d88eb0cffc5ca3cb35ea3fd19595975cd451b2c188b3e1f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZH5E2439153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9e8e2733409dcaffac1b4d8e5b79a68bb6af60d3760ca8a17482dffdbff245. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZZ7M2413896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b1edaf0b88143ba279ef14fd0c4814cde0efb95804cf0656c90bf79e2b05b6. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/DEH742500610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901e36981e07a8326faf7ed3f74e949727037cce930b272805098f2022df6aaa. 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/QZDA82573912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186a0aac519ba4ebc24128cee5b692e41edd84fb67e2d0b8e4f4da349b2c14aa. 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/CA5KR2536507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce7a31e0affcb256f790ff60b84cae064880a6c78915772bf284d14172c952d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZH5E2314243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a811c837dd86ebc51cc3080a0e74e4ba742c4fd129d93b0b512b32281ebb05. 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/QZMHL2238671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a80b1f3b8f6c179a38532c9d814a950ca84404514e178fdac6aeabbacf0ada. 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/FRX202335041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a84fc2a659aa325d006c34676ff319623e517db0e87033cc8e480168f8115d0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA72431962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ea504389f229d31c9183bf74c109fa1c874f3694da0e71768bd0bfbbe73ae1. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DECY52101694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65505b73c2dd26c3ede73e4edbbfc696673c1c870b2332f0141f8c5b467595d9. 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/NLCK42236764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3f43ebbc466ec1d616486d62bc7513fe15e9c455681cb3a6817c0bf308c1e6. 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/NLCK42236765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbbd3684613a86267379a082b70639154be8a1c10d8d2a92f3d6159093bc541. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/NLCK42236766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1c0e8953ddfd069d9e342760c1f5114439d45e5f9cc3846a701769854ad4f0. 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/NLCK42236767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e0fae967befc7e0be0013d80a40720f1b56a23d74d00322a8564a733e25cd2. 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/NLCK42236768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8fe8be42e6fe65c065c6d592214eb8072e09322af1d2d6e2b15d6b5125f382a. 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/NLCK42236769.