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 0xe50b709dc705d1725069aca758bb1398d8d269d9040853ddd5d107d432bbe6d3. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a41f8fc-b052-4cfe-a796-e2fc72980cc6.json and https://artists.proofprofile.net/proofs/artist/4a41f8fc-b052-4cfe-a796-e2fc72980cc6.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 0xc694ae9a6c976e6fb746c4f57d5a078ea39e35d590e88ae97f5f5b7f655ae0ec. 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/GBKQU2473235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398ab10ff8fefbed2cb3e64a9ce902ae0e2d09385dfbec28cd2bfedffe2ef35c. 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/CA5KR2466151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28da6efd3e717a736e30b0411bc477c8febfee45b6f0fe685ad12c2cfd87c9f. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CA5KR2444991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9283057f427fd0eb8e155c9988f1dbfb997a5cbb59b2eefadb19e46552e69e68. 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/GBKQU2421778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fab7cf431ed4ac24f89bed22f2fa788a38f5bbefa8f411f1c7b2d0b6e352710. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBKQU2421779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb952b2ca6c1fc91a8fa1b368dcbddd6f1cc2010bf8441d912a0e7c73dbda0048. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBKQU2421780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516e3e3b498ca0949a7b5545466a2ef664b1c529b5e0d6473c7b19484ffe38b6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CA5KR2413184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b66da07ef16f54627e30539f88afe479aa38d639ba5f3f16a1e1cd68fab31d. 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/CA5KR2413185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f9915f02dfb30e400c9664abec9dac8303f4b0018bc88987598f469e85d2a6. 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/GBKQU2378488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465c3ef8e104eb25fb5cbf3a2eb2b5f99aadee4f469185c66ede8e75e8c1f942. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKQU2358229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9cb70a55c4a598e34d32a28662da6c12800db76b8574f70dc4772fd3fd88de. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/GBKQU2353828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d44d5c0436f187126ad6e66f07e6f046b1057e36364841da543fca301fadf76. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/CA5KR2330338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4ee68c655c66a2774654f4e8beb0c28d3c14102067d8cfc3dfc315b55cbe25. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/GBKQU2056532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549a3a5e07ccbd8d75e88335246e4a541f61d61200b0c4adf15c320bb4b586ce. 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/CA5KR2039461.