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 0xfc433546d9677eff4e4f297bd611cf7e38e1b9ace4cdea3a6894821ea3a8adde. 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/7f849cab-1614-47dd-ac8f-64099e870906.json and https://artists.proofprofile.net/proofs/artist/7f849cab-1614-47dd-ac8f-64099e870906.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 0x2689802d774dc579ce841bd14fca634863c0095fda6f6d0b501a53315de7cf0e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QM3DF2173423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf523914373bcbba3c1505675323bfa4386806f6492e1e8a02f4ee0520b27ec99. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QM3DF2173065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc54a7f6f30557f89e7bea61d67e524e9ea86c2bac697f8748192bb0f2d71266. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QM3DF2173643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12c83caa6a91e1401a6d5855630acbea2be2a05872a5d955b18af04bce4fd18. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QM3DF2173640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2703e7520f1f8ae36edab75231c8e3cca2ecfc21e420fe5f02efe9cc13cac204. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QM3DF2173642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ee9dee5eba721c832f5bac40a904a17f29888fa5d50cd509fbce47e3c948a7. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QM3DF2173646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6ee60d7b9665685903828c4ea700c7ec78f4c781df9d4c5b2465de9c5933c1. 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/QM3DF2174415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75eaef6416afab2cd707b9c1e00c8cff10b74676171d6025ba7a70b368464ce. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM3DF2174423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ecdba44141f09aed12d5be7e1859a0b66de5c37d734bfc872d573a8671a68d. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QM3DF2173645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91c36761f5ac9cbc76085f985cc6e15bd86ecec1e27064d9ba56f26a7c0c19f. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QM3DF2178403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcc82c883e06c59f2d9fcda7e50a66003200029921e31d97af30bd0a556bdb8. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QM3DF2184824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7bd2eefdb36ab701a79ac97a7497b1a19910c39f766be30ffc2a020d78e02e. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QM3DF2197643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9947c7ad775f00bff80ef029d2d9b090f461bbd71458efba5ac01a3f96a1907. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/US3DF2253748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e594bc2062468593275182e4bfd6cef677580856b1dba496b1cc977a713135d. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/US3DF2268953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173b06dffe212467193ed783c62be5cba26fee8bf85393b38ad32a294e4ee8d7. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/US3DF2268954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664026348e8002deba2c2a10cb49e69d2635afa7e6a40bc16c9428491f654054. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USANG2212233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4c7af8837ba6128300b712d5275c3ab3b2f575fcef23b35fe2129053adc532. 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/CAQOI2200185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bfa38c425edc51d01c8a58c43a65538697d9cfa07a7d07e2fcc30a17a0349e. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZS652214084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d57854736e3b54960356d06b931ffa463ec6e8bbe113234ed2f5ef5444af05d. 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/CAQOI2301689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7454043068f66f15204021452b885bc8c4804b8698a08326748e6ef23f84fdbc. 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/CA5KR2374125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9b572e2fadf10e9af0b953715b4e891cdc56e8602f2564d1dbc3ce71c528f7. 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/GBLV62304556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbaafeba160b1f14b954dd73b6081d14bfd3e0f1034c7ddcd0d9c9c0056ae4b2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZZ8B2503610.