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 0xd8ef8d5c971e69c55263db958d6fd0a5ff37bc61cdc02669a3ca5faebbf8e05b. Chain 2 (Bitcoin): anchored in block 953972 (2026-06-16T16:31:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2abba1cf-46e3-4f01-afce-2125c0d92a05.json and https://artists.proofprofile.net/proofs/artist/2abba1cf-46e3-4f01-afce-2125c0d92a05.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 0x305a828ea3009c07129c0e91ae4707450f080b0318bced152a9b5a0b278bf1ce. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES75E2400410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44d1efcefe15f0a43bf8bb00be8426d810e8c6f776d8ac950f892581653db41. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES75E2307033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff05652c7fa3670ef0fe3f202aada86d53d5732dfa7b82b1064116fcd4bd106. 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/ES75E2301926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70be0002e5c6f95966700f2d99ee94f3b5989dac58f79f2bf2a6ae3e59433971. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/ES75E2300433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04dce1b155fe9f4f3856cd2cb91a2e1119e34965f1c808532451223dcaa828d2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES75E2201932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684ded37d49606d12262d63087740a34f218ca478e73fa35442870bb63d9d800. 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/ES47E2008376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187f56926ba60ec2749a6bb73cc48b9d29409f08c3e453e74e2cee760351f72e. 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/ES75E2301965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c8825ff8a9c44901d9038960ce60a22da493ac6b17a0a88d0ec30e060ad36c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ES75E2301966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1a14353c0abfa7a474f2d70768afaebff9f205f2fae8134a1dcfaa1dbf28c2. 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/ES75E2301967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528447d50d1f04e5972038b27b710071176899eb5ade6d07241017254f240e77. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ES75E2301968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c61e263ab13c3e092f310c7f884c1a4f9d7245fb18cba10c94c3cfcea89e0f. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES75E2301969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc3915e513e6853de24010cade144882f9f97b0a76c9a0efb59de9ce25b5985. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/ES75E2301970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d7f497b66efc5319532cd2d59610020418528b1965548ad977c1b39182035a. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/ES75E2301971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ebf1108a7114f3c0932db4b6b7f65719d94bf98cc396ff2846b516cac31753. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/ES75E2301972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b89d811fc21f340e20f90256adafac84c80245f840d19ad67dfc186b1fcdd2f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES75E2301973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59424ce3cd957dfda4c5b94fba19209799358b1fffebab4263beaf933aac5f3. 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/ES75E2301974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174c29b9908d4831a03fcd8e6a7b7c44f9946ce1f6d3e5561eb3a4d58566c4a4. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES75E2100570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44399f0bf2ac8aefd4c252e8512d5972f4f7f3259ed39472cf012f8fc5b847a5. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ES47E2008742.