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 0x291780f142d62fb07fca40043fc575a7326950e564f107ccb8bd0f5f3dc465a9. 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/3abc692f-a4f0-4780-9acc-bfc8d5bd208c.json and https://artists.proofprofile.net/proofs/artist/3abc692f-a4f0-4780-9acc-bfc8d5bd208c.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 0xc4f37415f8ea18ce038d6ebb15fb26c559bfb7ba6f1577d1387067a97ec2dfa9. 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/GBRKQ2265485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595b8b0811a9c31ec012979c54cb8c6babf57d370a0f774c2e04e764353822db. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZES62047291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5544cc6fd122d273c4fcda718b2056f160029fd92c5deada404df942b681d2a0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZDA52061721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1109d72ebca784047cc517d5e6b9d1729e97dcc1ad4427caa2642cc910d07c4a. 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/USLZJ2148769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f78f026b0b75b7e200ff443fe03c4acfdd32c3819ec5bff0d017b77fb826e4. 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/GBWUL2111092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25874972ac6797e928589491bf33f691e733424dffa85a1875a505bdf346d1e9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTV32205579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a947b850fef34356b6b9fb6bf23e0b2e5ce2d0779ddd42a115bcf8318ae866. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZLBC2312021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7abee0e75214da446cec4c8f646b305eda00784e8568e807fd7becb74299d3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZLBC2318065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd701ebeb3ddd2cc42a37156d9c485ab6f7911b4532a465888f40ac49f75c21e4. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM4TW2404603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8234e36c493a2cc1e186ad796b80b2469c5c3cd9c1d554339ce0d0beacde3943. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QM4TW2463952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe735de3c20bbcda8472e6665122755f8fc573126162cb52ac8a02bf416a7d558. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZLBC2405761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434f57246c707666b5b96d937436a7782fe8bd639fe3e2ef794d63e0730c4534. 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/QZLBC2417308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5522b6a98fe5c3ba8b9eac5b9ba143937436207dd494d6f20d63c6c329c4b50e. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZLBC2416629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ef096ea540692853284f41d6692580af75e8195750595f5c6c60af4e8c1e47. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZLBC2417309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a894593a7a97c121992fe2954ce11ea1249d08e870041aa573dc3c44e62a2c. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZLBC2417310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a3b88da072197ad2b1ba90d584e1f9467652a9220a4e5e86543acd4d44e95e. 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/QZLBC2417307.