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 0x71733c30099b1845d1a138fefdda04003cad075084ab8e748562de316738a96e. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/490abb81-67b4-4810-950b-2e4064761ec9.json and https://artists.proofprofile.net/proofs/artist/490abb81-67b4-4810-950b-2e4064761ec9.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 0x92639858ac532869ec0260d08d3f23f352c6e8c76e1da3ce2ead55d7f56b9f9d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAHC2388624.
North Face and Tech Fleece: The 7th Summit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1530c4ef0902dd75f68edcc5d26775ab2a3e8e9c478fa55205499b4a9ee6fd. 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/TCAHW2478225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6904e5bdfc8635b3dc03b44dab7a00b9966de2c7e7c9868b728c8695b373cc77. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/TCAHW2478234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff1b1ca4eec86e05d55d1eec3555a3ecfd1c84bd9e928fee8041e5b986044bf. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TCAHW2478245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8931c736e6dfd9debbf27993e86ae5c69106c82f3469aecf52f1e3b7c0f326. 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/TCAHW2478265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1eba7baf647d5f94e063cd417edf336c2dabb6a47aee96a7b67a370b5781be5. 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/TCAHW2478273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885db789b7050ac68d705836c9bcb28b27cfe37e043c8217716d761a7717df95. 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/TCAHW2478297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a7c17988ca069cc9a1f07a77cefd84dc43e246fa4b9712299771eee4fe4df4. 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/TCAHW2478302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ddfaf4b30291f0a5e4eeaa73cc66d257021bb2f793cc4b3dda3a5babc15060. 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/TCAHW2478307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b77da0ee6d5de0db5a291d6b3a707769a3243cb4c85c08a6b4fca44701c700. 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/TCAHW2478321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e5482dac0433fe24f0909be9ae6cf4be45938553c0f88ae4bc83ae8e60dc7f. 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/TCAHW2478335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa41b9971ebf71f1a9d5420e0c6cda0566ef1cab10167d25ac1bb9299131d68a. 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/TCAHW2478347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a9c170cd77b52f89e8ff4605113042c3c822c954c8523c877c527f35421862. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCAHW2478372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a812a1a673de5ec88c2d26eb5983cb5f3d4def6c55be79b20c600f27362c71d. 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/TCAHW2478409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6136f306db87f75f648eee24cc1dbbbc97be46de527572d0bd3cd5a61e9b75cb. 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/TCAHW2478491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4543372fe5bebe1c04af139332725bfbd09dadf9a6a8de9376f00ba73ca2d831. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TCAHW2478521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806e3bd1d80ae6c6eba51c7ef7b8b1071f12001dd7af23c7e557d09d3d9a752e. 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/TCAHW2478542.