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 0xb41a13de755d0b7c556d66f49f77d6597cf1a2917b687695bf9312b16141bab0. 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/d2d34e09-a94c-4526-940e-b5e0cd8c72f2.json and https://artists.proofprofile.net/proofs/artist/d2d34e09-a94c-4526-940e-b5e0cd8c72f2.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 0xdb131b8a0a379365d96f750c3c2380e134298cd269db5e35b56b60266b95aaf2. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZFYW1967125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752196cf0a0ed67554b6f66ac95cef546b418c8b7d8f438daec5562acb6eec40. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFYW1967126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b407e1b866983a7a7a52589ce6e7b3e74a74bc9077362d44f2368f1be89a44. 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/QZFYW1967127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed680f003fe180e88f2e40bd9f8ab7f9e2fb6ddb88796249d47042cc17e59ee4. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZFYW1967128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c7ff81a6d212667bc94d3337d32e571d2aaf3e0a8415ed9e982b6ff75dc0ff. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZFYW1967129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7afc867374ba90830c3fee39afc37484cc67b48383ff9d21e92f0bb92748466. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFYW1967130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42bf22048f29c62eb436007725823fc28304da76e5c725191534f62851f2ae2. 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/QZFYW1967131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb98661185293dcd3d862c91ffb0fd4a9f65db3e07587208cf550f83440986ad. 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/QZFYW1967133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27c794ccd848830869966c982e512dd55d433cfc5bbd7e37e5967630507f30b. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZFYW1967135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8ebeb57217a82e36dde56f91316db23c27c8d741b113a5ea29909db53bf5a2. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZFYW1967136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bfa8b8fecbc18b029e35da69856bdfa0afe3e0c65d82170884984bf9c1fe8a. 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/QZFYW1967137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739478a07b2d58f0aa7583541a3b41cfca0ba38fe0e19ec5698b0cc344e3d187. 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/QZFYW1967139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a26666a88feab520073ecaf2b9ff6f1385a5e3a43ee38ecc46b5bf653835b2. 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/QZFYW1967140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8d248d0e92b2d91012fbd14ed90a717eaf41bc0c41d2ba7ec4000ece483798. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZFYW1967144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0677786d39c652b803b9d538b4dd759e72c5cab158070842fe84d3a3d1eb1153. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZHNA1922041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72f9b989cd9358b7f6a4ae1a3b6dd46abec003ed865e2c65683f1f15e1ad8bb. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/QZHN42033495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b364438289bace03795e73bbf12d9be26886713d3fd20bc6940a7966378d0fa. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHNA2003132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad93a902036793f8e2ca75b51b81ddbc330fd70e69fa1061423c1047221b4143. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNWV2196677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3196c66c2f30f5a1f66adadd0481e2d5ef70c6fb8000e74fe3539c44d2dc56b. 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/QZNWV2196688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae290c236358ad268278562a59ebe574177a4186900acea7f66d60107bb7b4c5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWV2196693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed046ec6c1d13985279220ede31792fa31b038c864bc77155a770c00f2517b49. 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/QZDA62292735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb634f6c40c94354dbedee7cf9210e09e7f6b1f46722bb5c25bc422a1fb49c5a4. 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/QZNWS2172641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0fe7b76328c3479121d2e9bc9a94e67f5d8106121e5acec5b6321ce26ad582. 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/QZNWS2172642.