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 0x86d7a29dfe0c071c56ab5a6ffa910aadebc9883bf572522ba34429e313183874. 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/9697d66d-c4ec-4868-8b24-01937c405012.json and https://artists.proofprofile.net/proofs/artist/9697d66d-c4ec-4868-8b24-01937c405012.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 0x250a6ead48d2f8f625ba06fa6ab3732fe63e46baa4c78f938f8553fbafd66a45. 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/QZTBD2327641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2e3826c862c8d8924669d29953488710b65addd8dd46271ca789d25bf4c6f7. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZTB72356577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2b66a6549cedff577247097081bc0f43eb7182b4c810ba85090ef2dacf51cd. 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/QZDA72415489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57685fa66fb1ee534bc84af4635676ccd34fe52c3b71fedcbb7750daf91e637d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZDA72415490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b94df4fbc295f05df741c7ce4a49ba570d98656913a7d389f7aeec9a16be61. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZDA72415491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250a6ead48d2f8f625ba06fa6ab3732fe63e46baa4c78f938f8553fbafd66a45. 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/QZTBD2327641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfed96473b8320be96bd05f1230ff29b5f0034177b7f5b348fd643658a9452e3. 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/QZDA72415492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9321f99aa9b55ce12552c7ad6d87e2960326f2c1ff78a9a474f0e221eaa68fd0. 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/QZDA72415493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31bcaa662a7fb6b1ab93bc39a7b895601c3b26c8fee32edd18eaae53f68e569. 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/QZDA72415494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273f25496b102c6e26510c124d7db8f72564031690295d52938b4ef40c036bb1. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QT3EY2440625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c25d456c94aba1efd2a969bb98a30a2775abb1d970f6062bffb9ce7fbe81b1. 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/QZGLS2489566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c6b4a65373604bbf8f7956eedca1a0fc01256ca4e40c059a62d508941d5099. 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/QZGLS2489563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9694f17b47c954a3242f9787aac83306345da816461b8021a45bedd38ca7b0d. 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/QZGLS2489567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75629563c159c2328a3ab0fe31fd3750efb3f3314e7f924d73c2568b473fd706. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZGLS2489561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc08f04075e414e9709f29382d766c681eb1daa92954ce7cfa615a3b1021a5bd. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZGLS2489564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4f0456850684f90903dbb1b98e54f7af6830244f4bd2205cce7a8057f58ed3. 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/ES71G2419515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d4c49d21a09ca63ced624c3b5817eed0ba63e252274b716f250d74671c123a. 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/QMBZ92464490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf045a02f6a8bf697cf5a47d432ea15b6d446022c7e38c6f158dc1253ef675915. 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/QMFMF2378378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58794ce2b64826348eb810a122d18a619c2418f8b56fcfc6e0adbb6ad6166c65. 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/QM6MZ2514642.