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 0x143324bdca7826d6f520745bbc4134a672aa3d79bd037a63574303f4814e3be3. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/977e4e17-76bb-46f4-bd01-6ae9f91b2ac5.json and https://artists.proofprofile.net/proofs/artist/977e4e17-76bb-46f4-bd01-6ae9f91b2ac5.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 0x3b3b56f526f144319f5238948ab5b28f396912bccbbffb4e30f87bb996c9f417. 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/QM6P42486395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f375ad25b6fa5a0ecf593c5960e74b5f6793c0509399c1d9eacf189091e977. 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/QM7282463567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6cad1592798a8a158b613549ce40dff3beb3fc9d604421a5cba363ab63c75c. 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/QMFMF2414949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18e6ada10173bab8386de3ceadec91f796d4bd784359a3c91c9e72bbaea7627. 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/QM6MZ2538164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052a187ae2a8028d64ee41503bfe9a9e4f45a946a839da48f7e4797ebc2b6746. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM6MZ2538124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba37ac4874b28f4dd7f35e11def6172446bd3b97344496864dd9cecd8ab1299. 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/QM6MZ2538153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0456682e2ae165a7235e27a42b642bd6b9f85751bf19a368b1f0ad3ce00bf46. 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/QM4TX2570669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23983e9397aa6085b0699fac0b5e441ab428c27f245d09ba697d8aad395b9ad1. 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/QM6MZ2538152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7728aec664a6ffc584df28b462a4f20a54261690c9f385ab9df72c329770af7b. 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/QM6MZ2538167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe624d8a85eeb06b9725ce6c5407ed27ccf8c5b84918188728e1db49b5b2986a7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMBZ92581465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28ecde2ac31d4d16457ac6049ae9ad21dec3cc828d8de2f8a4f9e6f5f641a83. 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/QMDA62534367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe179758da1540145758703483b82ac6602fd17c49a82ca7a21532f171bca10a1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:57:48Z), 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/QMDA62534347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181d7f819e798142d002d19fc432c2a0c218bc985498008131535cd2eee88d1e. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:36:20Z), 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/QMDA62534353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28ecde2ac31d4d16457ac6049ae9ad21dec3cc828d8de2f8a4f9e6f5f641a83. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMDA62534367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6df57913394169eccfba3d5248428ffbdd649e169b1cbe3c5287a81d8155ce. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMDA62534374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e6d9bef26d3aca90cc117fed9ec621baf2b370f5f36abdc211d56822c1c8d0. 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/QMDA62534377.