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 0xd9b067e1e4fa4cdd954bc0fc95b904f4971881d6eee508fc72361eb29a386b05. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b15a242-48e4-4b3e-a56d-9fa9f0b09239.json and https://artists.proofprofile.net/proofs/artist/9b15a242-48e4-4b3e-a56d-9fa9f0b09239.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 0x728f5c1457c236aff4c3ad9ed9c2688a96b336ce2ef66f65548465069c19cebc. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZNWQ2448702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434d8380ebfde1afb1886de39da7fef7b2ed9c6cad40e0827bc55063e1e011ef. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWS2459397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9cd25f4ef1a76bc8dd7a8bb588831150beee38e31d20e2df677130befbc69d. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZNWY2456689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa768f8385ba08a43040fd575550871d8d007b478909c233bb68afdc29094e96b. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/QZRP52400557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739e29b83bd28623d60cc7b4063acf0da2bf0a656b4d4ede321a41449bdc3cca. 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/QZTAS2418222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29c0c57041e33389a7f5e9421cc19808cc6aa755e883c88e3cca81f3606c266. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTAU2412259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b19f61c8edb4daf16fcaac778a62eea7637062a756c69659a8ab3181527a603. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTB42439081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dcaaf3cf11beeee5b53f99719437515885afcbebba26d66e4580ce2efb9bf71. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZTB52499551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4c1d6818ee9ef0cbda6d5acced76f024a649c17f337629cbc1ab9244bce938. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTBB2403629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686b8253b1376e3eadfed347833da2862849f5cbb67bd877d55220b1b20c1774. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZTBE2447432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef15228937f17c3261c9f04053a703a6451b19e3fb33b38776b0fb9ef69fe51d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZWFH2417435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb471179add47831f3e0730a60af24b050ff96aaaf846ca85783afc06d63d9f29. 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/QZWFJ2433841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d8e6987668a2bfaa9cf2e1d985ede9517c733252ef28b525151af291687575. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZWFJ2446370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d619f4c7c0c07342d0b4b80b39bcc2a4d22c5af9737c972adc2bfef5bd9e7e. 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/QZWFS2420989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2a2aaababe86232f9359f479d5bdb77ab1e64eaf684c70e526fc7ad1b47d5b. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZWFU2433920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d5798d2fcf11f0b7665c86f48d36b69afc28396b709238dbe8026910f45a63. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZZ7X2429278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e1e774a0af038a955735fd4adb089e6253fab525f712b76f2c3d226907fdc3. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZZ7X2432557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352a73d5c7a11830801a70257538508387498c483313da769a5bd435b6a2a129. 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/QT3F32420337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef76a291a9ae81381b759924f2c994649d298295ea39c888cdef7ee225dbe44f. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZFZ42547530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fd7f1dc3062fe2d970989bd0535fcfea3040a226904bbf8d7faf19c91cbcf0. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/QZTBE2554827.