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 0x66a5643794ea5011c9d0de932cf062ab1bac5779bb6e1685fe2c7d8237ad433b. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48e708ed-62c9-4f2f-bc2a-0abad9d30f14.json and https://artists.proofprofile.net/proofs/artist/48e708ed-62c9-4f2f-bc2a-0abad9d30f14.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 0xe80a8e959113a96a03e68cdd342fd730635744f1463bd3b992c190475fd13fea. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZFYY2221513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281ede31e48931d5f6d235a21ff4544ab870fd1b6bed30326069094d6085ee02. 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/QZES72232847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a8d99386a623b0cd7eeec5475c9cfcfec129e8bcf2e24bf1f45c8c38ba9d6c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHNC2229816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79eb3069da39c3cae394ccb9db2519038d1ec2e0b54f7e9c95207311eca71c5b. 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/QZK6N2233205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a06f508d15ea56941a37082fad5293e6948d0a51579be6049f5d0cd8810ae17. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZPLS2396128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5acabdf16f0ff7350c5a919fc46b5358526533a75abff11ce95a850a748e5d5. 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/QZHNB2400957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0ddde7d6cd39eb3eb411478e1d59f6895d27339bde6403c79485d7c01519a9. 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/QZWFH2482800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48cae92def1f87d70524c884d3e0e9088d4824c6c6a924a32700239737341e2f. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZWFW2464735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d3066d83eba80f9ef9f35a704ac1ca1fc9769c93ed810acd1db7aee4f19188. 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/QT3F32477140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a03611147357ed455a40edfc8f34f6de6cddbdfe98b6c5df98747700b551f89. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFZ22550502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d0bfe8c364589d82e34777f37ab25caf115cc909cb641175c988c6ab8a7346. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZHN92512037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb872a1f32b706342491d003e275a32f53f3eaea0c762d85d5020748e87a46e67. 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/QZFYY2217659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85840163e65066d165d0c309b19993c481757068879c7f8fe33bc0a41847423f. 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/QZNWQ2229212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ee0c7f3e1b3586194f7c5b0d297cd3d73f03dfb2e57c97cdca68329ebee56b. 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/QZK6J2268023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a54ff1dc19d3eeccf05ce3c5fcab7e56577938e095ea7c351a7a9051e8d4e3d. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZRP52206438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe86f2ae83ed7bddebba33bc7a8099e51527567b24667a9cf119152f7abe45f2. 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/QZRP52206440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5409dd849aba1fc3b7a17dfd2c5c5621d324c44dd900a3d9e40c8644f7d1ace2. 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/QT3EX2418423.