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 0x21dfdfc9e587c843c2619cc19c2778c5c38a090657e9a25aa7c7b35cc8277e2c. 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/880407c0-dea8-49e3-8909-0b7b4b80eb0d.json and https://artists.proofprofile.net/proofs/artist/880407c0-dea8-49e3-8909-0b7b4b80eb0d.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 0x4522f9f95e6f7f8ef7a7d5c67ca9e11b12cce7aed13c65fcfc4d5801ede7df15. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ES47E2008680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b71975f02ffc7cc1d9d4d189f2355335a4b0e05499b4dea8966375f1fe11a2f. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/ES47E2008681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0494721463152ad3ffedd3d4a2d6353ef650b40e191df19800a48072a45672c. 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/ES47E2008682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2056476884b332feea0d19f974a113b953e7f803e3b29425966d31cc43acc7. 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/ES47E2008683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf749ab8c82d2beac7ef8dfe58b8020f87dfee4ec95c86ad864ac8da945be2f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ES47E2008684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfe33933b47d7fd2a9e8f2f92bee2278cded8f2e4643193094bc2a5c71ee3ce. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ES47E2008685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70bd422d0d98fa511a78df71c93e6db47e7f3a6530bd6e8e2acd4896d7f164c4. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ES47E2008686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2f268eb1abb3a2875a79342fac889e45210fa6d32f2345fb6fef0c09daaad8. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QMDA62232211.
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 0x397d24317435e5722a630a4bf726103287a73529b14b78fafeaea9c629b15982. 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/ES75E2200831.