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 0x1444f7c7467408b16b782b187a1d83f04f919fe5b9bfcd6b5b835bbb344c3919. 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/04d4ea38-44d9-443c-8424-67c2e1a2c9af.json and https://artists.proofprofile.net/proofs/artist/04d4ea38-44d9-443c-8424-67c2e1a2c9af.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 0x556870956f17b579c020a12ba44002d5119549d1dcbcc4324c1e4f7e0769a78c. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZN882078046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebd12e44337e6a05dc5ec96e94392159231adaa1e322b19e3c25dfdb65e7630. 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/QZN882106344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd906e95cca0c603a33c9569a8a4c79bb70feb84bc173075cb98bef1e3657636c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZGLS2142891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97fac4a88b4e15c5cd195b2232c3a36536aa2885d3d6015110ee097a84f7462. 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/QZHZ52176484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b37b93076cd7ebdacb6379c4d1bdae4b1b13ab935f6f42d46fd5053669afef. 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/USUM72410287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31dc02616ec57693f7538e40a6342af36ab9dd61d3d992bff7b492fb5d6a698e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM24S2201959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa842969358dfd5eb9bdad549514734e0f52d5f61e3f468fbd9e1e91abea5b7. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USUM72500038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a69cf44d1941566a77895db9a769df72322b4057661bfb7add21066e3805ae. 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/USUM72500042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3f0befe752daa52b2238dc49646cc7d4add8431c44fbfbe7fdcc5ab45b2529. 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/USUM72500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152f698bb553f04e851a19218dd1bee4a41742ef4c567c97e72e1e93e85a26a9. 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/USUM72303242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028b3ec10cfcf610304d3785066d6ebd1b1295dcb2804a1a8994946c412639e3. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USUM72500044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc551ab5a9a1af68f04ade3b14b30d9c3bf1e04d2ab3bd76da6b5ad53974b0a13. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USUM72313083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a6bc800ed0a46d819e1a0e1eacd14e84c6b9842969fef48b97544d1677d326. 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/USUM72411385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a821b67e9d8a5867f4e8649f0a3653b74ccdabe9e41fe57fbba7a715aa7757c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USUM72219210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8f44b9dfef6f5f3db5aaa74b3a17f96abe870a7461538f96dc75caf40e5224. 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/USUM72500041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011cf381c86ec8510bbb37be757d938d318280d915bdff570a528d7fd8cd6d65. 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/USUM72413998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2009e9e7d716257f4cdb1566a870339ff703ce897d57b99e1fae040630888f. 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/USUM72500039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc551ab5a9a1af68f04ade3b14b30d9c3bf1e04d2ab3bd76da6b5ad53974b0a13. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USUM72313083.