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 0xde366643e160d863f62843b4ae3f3a4929c0a777ceb13ec0afef204c1f945ab9. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7e871606-8c5f-4a4f-9761-7a066c200d07.json and https://artists.proofprofile.net/proofs/artist/7e871606-8c5f-4a4f-9761-7a066c200d07.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 0xff318e3646cd4b35c2db1a895b2513bb3f32013073241c878a6ef7ab3c79d27c. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/DENM12200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87b9f49936fabb6e9c8685ad051d391cf5d3ad1f9f263fea7469c2bec239f34. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/DENM12200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004ccb96cdb5034fe9db1c4ed1274cbda3d63a16a77df8f648f360fcd3f63bf0. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/DENM12200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151fae3aa0e45b6d89e0c091fc00546e7d6abbc10da4f3cbcf4ca6733c33fb0b. 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/DENM12200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c54c7686820a729fa49054311bedacdab503d1918af2338d65f391a43f01b8. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DENM12200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adbee37e3f6e40cdd94939c12e4d7449520b3a3d6617ffc28f23216b0f378d2. 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/DENM12200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e3cb05639532845154c2399fb5a8004e6a23dd425f308bbcc3335df9799eac. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/DENM12200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d08d56ee01ed84e10f9dc7f9c89654275558d83b75e9a100e2381e10355bf0. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/DENM12100248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a952699e10a67e71649eabfe90aee628e9c1609099d936246fdb94221956e9. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DENM12100249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4919a57fa7e25ca4721c8ca63d5eddd802d4d5309ad1e0ce5a60e63435e8268c. 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/DENM12100250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8a20400e7df6a57fc4a89d982072df54c9ca74edb114be5b007cd6dfa97d89. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/DENM12100251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10da53086730a2f6b838eedb9dc88659f5be15690b217ee77644979c7e24d6c0. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DENM12100252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5ad21c14c82999a6f48b1372ad0af223f60739a57295e804a204bc494246eb. 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/DENM12100253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0279319d4ae30279ac33a8d988259b27e701fa95c8b6671e68b0e4fcb0b3789c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DENM12100254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9010fed351f3298978fa9de26303d1bb662dbb382cda180453fa7a079603250b. 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/DENM12100284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f4866623c5db2a8c89ec92fe179a9f664fd0620db55cd2aec8178b71a1e6bc. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DENM12100285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea43732cb19ad3c2d5bdc1116db00955c3642f63de8f4d0022fa562b70c4d562. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DENM12100286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2739cd39757c40089b99127baba421a8760608dc20e96844d47f55c2432de11. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/DENM12100287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc331d9bad5854059a605d5a952f0da0ec57709a1879653d71bda6f3ee86cb1d7. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/DENM12100288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333ea05b6d32e7cf0d385372af653e38c64266cd83c532e7f65116fd9d24ea02. 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/DENM12100289.