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 0xd290400134aeed944a3265961f47acbc7f0031c51ff4a35eef3599e57c14b76b. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb1e67b1-e53e-41a2-a830-2d30448cd836.json and https://artists.proofprofile.net/proofs/artist/bb1e67b1-e53e-41a2-a830-2d30448cd836.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 0x14b17cf1cdcb3aaa63fe2ffbbde361cbf9ae3f0de3386afb4156a326c192030e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZWDW2214747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68425ac171871e8075617829fd653ec04814223ca6734e6490ce0b1bcc36de17. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZWDW2387573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc29ca8e5654882154899c03045c56c74ad73ad4a70828ea03acdea4e6e78f20. 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/QZWDW2422632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5755a3b9aa4096f53993ebee241b14aafd9e71452c206afa49ffd99d645f4f70. 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/QZWDW2381369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800006209f71040fc0fa07f6aa8e9100c6f253348c26e8e7240bcaedaaa78842. 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/QZWDW2379788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d2080cf97c6cf062f513af2e8f82065de7fa62857dcfe31c1f0193003804a9. 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/QZWDW2381370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4748e4184701d12242a53375bcfb4f30cfea214a2e60cbdb8ec4eea7aa49743. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZWDW2381372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033512c00fac69b87a3e37f38fb71ad0e89d0f544f47ce912847457870a21fbd. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZWDW2381373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3dfe7e41d4517eb29a700ccfffb2459db7ccfb87664349ecb4ed269cd8859e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZWDW2313012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c933b270c82d5d05354e948576d01ec545e59ffec59529f0d8a0ce88190bcf. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/CZUM72300534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d550034c996571674e442210914eef839f60f3ca719338be2aa27efa56a97e7. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/CZUM72300535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a590aecee7eeeb6a61b84f975762e9463331470d3163fd2e43f9d38c57015a5. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CZUM72300536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f033f05f763abefffbc323536f8897f4357c84307941f6eebe3f8a9c6a1621. 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/CZUM72300537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0562a336c2b348a2f0b15173d4231361230ee42fb9d03b29adf097de230ef5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CZUM72300538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bb0e3b6121122eb0c22ed0c0fc55d21549ad048d4ab0f1524746d2aac16ba5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CZUM72300539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9bbec21594b09bb13be6426324fe7c8765a99512fe54599d267f32c7f379df. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CZUM72300541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2653411b7ad8dd60f32b21f739feff867dc420e14929745df894deae7e42886e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CZUM72300542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7368302fbd9df8e373ff5e06c4fc53828858c4744a5af4e48bfe1ee06fb548. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZUM72300547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6c3d6293ce7788b2ffb321a0d73d09bda04f86d2bdc3392adbf21aa548e3dc. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZYFZ2383112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc98cc4f8a3ec27e0d3b14999a546addd9e50d00f07ed7357484b2b0f03c4a4. 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/QZWDW2210126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3a21e063143d7cb6e844c8fb1a277b0a36887a9414841816e2d05a67d726f6. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZN882301391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024f0d92134259555ca74ee3195f25f30f8219068eb0f9c6f6048a1c08bcd56f. 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/QZN882153065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9f21037241d6ba653bd17338f4531c64fa43ac6434b9b14468c6694442948e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZTAS2290032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a82e92d2367b3121a198850eae058bf09a78defa8b142b7be3500d9a7342e3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZTAS2290034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6decaf444ed42f4073a6d6b4b4d333f2c9b40975a063408be9c10dbfbc352f. 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/QZN882577593.