thumb|right|Young male catkins of Corylus avellana Hazels are plants of the genus Corylus of deciduous trees and large shrubs native to the temperate Northern Hemisphere. The genus is usually placed
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 0x54de0caf5aefba3f9f4412067471586fed7f94b9e55e88ee4cd13650cfab33d4. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab4fe172-4ada-47d3-875e-b563f8e6d61c.json and https://artists.proofprofile.net/proofs/artist/ab4fe172-4ada-47d3-875e-b563f8e6d61c.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 0x797518539e81ddb773ae91a7de57223e7ee65d010cb0b82ecb2fda1c3ea7b8b8. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/USKRS0331803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efe9fba264a895e2e7f31a23b73c39087b40eb4fff6954ca38936a7ff841caf. 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/USKRS0331805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58d0ad267ee47e1097b63a6bf6b76c305f9073b838ac603267c56310a8f25b8. 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/USKRS0331806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fd161fe0da413bf593c4ec7588babb1c5f36dbee787f9e41e89b2a4ddde6bb. 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/USKRS0331813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d81fd582295f6045993dd521fda7b716f58bd141c467b0ad205d25acb24d9e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USKRS0331817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62d5ed0b35fdaf52b2a06c1028dd00089cc67458738e1d8f38c257027e48649. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GRSO11000197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecdc9850666e61d530198082f6fe00e7c6a13d393bcd7083b0fb44a2afdacda. 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/GRUM71300928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb9905560aa30af70c4ece7a41cf49076f45869e597c5ca8e6c00f42af3d82f. 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/GRSO11000200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5268fcb3cda9727a58c52438a62695772e47d73d9b33b8daa3923d96c7169679. 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/GRSO11000203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2296b2921333bbaafebf7519f00e980138929f7c103a3b8cbfaffd568d03cef0. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USSUB1128502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec142ed7e457b7cdcc3c0e32477216da8b535ecd1fb7bf9cfe2f71b5069fa34. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USSUB1128503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb85ca25ff825fb3da2c1b123cd7ae2a8c76b1adea891f4ee3120c32c3d6e6c. 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/USSUB1128504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b746ea0689b591c752a603551c823f2cccec6f7906bb12d3a12064643054fab. 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/USSUB1128505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f3dbee2503a5b8ae325c9df9fe8b96680c834e45b26375de42b5855e3a7645. 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/USSUB1128506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b210641bd96093512ac0b641e1b826af430e3f989c54a30c8bbfc540c19fe9. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USSUB1128507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de3a853ebb9db6af5865ec527e9cdb17fd00547c2215a84cd0bbf389538588f. 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/USSUB1128508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10fbc51a40a4d6708f31c42e3bdfa2d9a68a1955d55bcf913ceb49da52d6eb8. 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/USSUB1128509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc62427c0fdfc1b5c8520b16666bc6b5d3990f851a2f71e1a2f97e35bcee5c25. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USSUB1128510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d4424445ae9d8c363ef8a52a616cadeb88399872902d4f37c26b5f0866b0a1. 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/USSUB1128511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda16f691e8884d36c250f4edc637ade38be6a0ff4cf4d29ad6ef793f8882c0a0. 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/USSUB1128512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49b7298969150b8e3c4cef4eb6ac0c8a302dcadc56f9c9a12f479d8bf949807. 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/USSUB1128513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ed6886cf4b8391ddefa56d9c05aef06aece56e7237b455e939f71358fe79b3. 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/USSUB1128514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14959821b2a9285337789a6fb4c1daad1d075170d7d2360bb51b996cf1bb4e5d. 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/USSUB0310532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc777d7fd5ec76bb0d8c2797e64c5d5fee0f8d51ff18f27742f5e73e402456b. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USSUB0310533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8ed5cf938fb0a34a808c344cc7a11ac765a5d23df1c7cec4ee4c4e66580ea7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USSUB0310534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x606364459aa611745b56e62f722fafba342edd32f7dcdce12502d3f082f3ff39. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USSUB0310535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8615e27656674d29a7b04f0ef3db003c3ea87280004aac11a9842cac8027615. 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/USSUB0310536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1407e6cf9ae4b7ae9436b2c74ab53e0120cca2b35ee517f653e6b674ab1ce8ef. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USSUB0310537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9bf2e425d59d7d0f30a8150a7a8b61f1803428e05574ce97b5b3012293422b. 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/USSUB0310538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4cdf7baccefa2b9a20c331af6bd9928090968d8e3d42d686bf8b3ccba132076. 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/USSUB0310539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824eae7084666a7b2e875050898d4a6538583768a4346183aa6d8b3c3063d736. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USSUB0310540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e254b9eddf18dd3e7e7bb836e0502b59c0bb9b8e6f78e34ca85740831091df7. 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/USSUB0310541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902884a82f145fd997ae89acde1892812619ccbdaa4ea6492ccd51b40b8bcdac. 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/USSUB0310542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f423c09a659e169da9a6f966abcb6244428f08968c3f061e595fed303cf454. 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/USSUB0310543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee245a19e0b93d7b3109a231cc6c26711d83f7bd5bcbe566ec57c2b8d4b97a7. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/USSUB0310544.