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 0x6ccde50fc5107cf33099623060e1adec447212f76cbe95b59e0bde0618394b85. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5f8d6aa-f3c5-45b2-ade1-07079f54ac94.json and https://artists.proofprofile.net/proofs/artist/c5f8d6aa-f3c5-45b2-ade1-07079f54ac94.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 0x04a77752a34264e96448b9912d179aa4cefcd0bb4d12365ae7fb5b3176d24fc7. 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/CA5KR2442974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f991074f4e032616d9bfe984d8ca18b72e70e525e7c55cc6552124edb67151. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CA5KR2442975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4546d93a2ac438d453e7b7243a9ba1faa80d5d12708b1bf6e295ee50d9680e3. 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/CA5KR2449624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b991e1f56f9499d46812f034a2960c6e55ee44839c300da452de2c1126a42d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CA5KR2449625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8336aa38e099886422ec01e57773ed12a83e168b8265b9356f9b150770e413f. 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/CA5KR2449626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ae2a92741ce44f565a7c6f60ceb13e973381b4dae943844f505bff6dcd0caa. 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/CA5KR2442914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3e03fd785944071deb88691e07699a94fb4809245b2eaf25c8b7f4f3790d2e. 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/CA5KR2442915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c6aac344f421973b78b9901db4cf24cea18b7327db16ce5abb2dd352e4f427. 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/CA5KR2442916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef461a14f249f2f3f101ff3623512d567d4c5cddb87f27bf7b80d2f47a00ca2. 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/CA5KR2435213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde73ae9a2391acaca9490f5800bf763bde90106e3fefd456ddbf05735e7fe0f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CA5KR2435214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a735eef2e23be4f2545e9f238019bdbad4f6e98b83810cc7c0b22772b17e7ab. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CA5KR2435215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd563bda477925287a890f197892a3f1f8d0b6ee8c35df8a04f93cb9aa6d89cd4. 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/CA5KR2435216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae82d013bab38b7df8f42caad8de5e3ddf82ae6bbd4bf297758e9f9e8d87d24a. 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/CA5KR2411265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b9bb18474dae84e51f746370a9ee8e2668205ff9afcf0d0aad3e24e619d9b7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CA5KR2332657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a41662da45f5deed941ebfcbd999abaff921e0d652bbebf235abdbea607b70. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CA5KR2371118.