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 0x3dac6247d6b4ef9742f9763c9b609dc065eb8fd968fa28be2c5c2cdfbefaedca. 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/462f52c8-e711-4972-a30f-2fe5a1eb91ce.json and https://artists.proofprofile.net/proofs/artist/462f52c8-e711-4972-a30f-2fe5a1eb91ce.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 0x6b59567b536150f0303dabc9c9eac944c6001af96a59426456b10ce81a274e0e. 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/TCACN1600613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82360bf332df2374c494990ae9045697c4987398610578345b5634fed91a705. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCACM1666484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10ecd02c2f757fd11e1fc3d3ee0f979e028f8c39a78cfe3fe705a5d2fcefcce. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/TCACM1666486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfc1613a7dc860df3c0bdd1762e5925cb28e4c78e6493825fcf7237a55dc4c0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCACN1600605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ab59341efd0b86d0051a8c7b44b78e4a4007f6056aa06cb79a32455935fc60. 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/TCACM1666488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6dba58db984b0de7babca90e93cadb04ea8bf3794a0a1fd3930802e0af97f7. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/TCADH1784646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3c34bf717e03ef72cbffef3e68281797e08bb79447062de3685b3b21ecc6fa. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAEJ1932793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e84b7a20f6704f5862553c6a5f88068a11ced0ee3d0d63c35aab6880102682. 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/TCAEJ1932797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa3251ea126ad7526cdf5444c0af2c3dee3ae2f53e6847d286caa8acc05f0d4. 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/TCAEJ1932826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c101a6a2bbd3d9711d7ae72c5f4cd5631b46bf405e62ce824ce99b95262a43a. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/TCAEJ1932841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ae6e740cba5196586215eaca518a59988f1b99efcacdfa7873c3b31970d096. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/TCAFD2077817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa483397c25b486390440f5133603d8d0e945d0332cfff63092e1684cd7f3f535. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAFD2077842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af0510fdcc4ea2cc32a2f80985ddf92cc1f2090841818e241b528fdad1449bb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FRX202175308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76509af0550deaae43796dbb9c6ab4d45856a1355e8449558109377882872558. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/TCAGU2392682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac817e73dff2cbc8b49ce4a3514b413986ef9fb1ef551b666781748e1594e9e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAEX2054784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeec5f6a31f74a2cedc5016f7a12c22e2aec978f6f932c88180b564d934f793d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GXHUT2550430.