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 0x2ac4e6848f22e302b3a443fb8fb849d4cb012816ee965b3fef35f839156e0621. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5bc4a97b-eaa2-48ab-93ea-f137ba2cf199.json and https://artists.proofprofile.net/proofs/artist/5bc4a97b-eaa2-48ab-93ea-f137ba2cf199.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 0x27ceb253fc9b4f0a84d077b094beb1f16385339dea8b60fefd30c78786105b46. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/USDY41587382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b573ba706a880005d84b14a60779db0cf919697432c31b975bd391898eb536c. 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/UKXNC2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb23fdc2f79acf99c3f491dc175f28f8dbae4a41019555e70d4aab79184b513. 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/UKXNC2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6736ae7475d6865f4c9afb39324eea09ebc3005ce8881b7e6f9a0da3a5579cc9. 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/UKXNC2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ea56f6abf0ed69aae479d777c8eb606b4dd760ee73f777d61780bb7f618a9a. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/UKXNC2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ceec00f4de74d3966ebe63740da257329458fecd1d45acc390a20ee33f0b3e. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/UKXNC2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88413d5a92acf42fc4f787cba545317a9c1da8be0b809357cc368cfbc549554c. 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/UKXNC2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816e16413fd2c81c7707653dcd99a7183d10941e5f24c3837b953933f7e20da5. 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/UKXNC2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc66541ee971c191b01a51abf80c326a0f38f2e9d68c6e905e5a18d058deeda. 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/UKXNC2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b80400ae517691ec4777da19358c9445ce4210ab366279b2b4288932184036c. 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/UKXNC2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62920ec4f7a90d7967d2659af34bed154f0b70a10b94919e1b249fa14b674fa9. Chain 2 (Bitcoin): anchored in block 957540 (2026-07-11T08:19:50Z), 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/FR2X42528478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62920ec4f7a90d7967d2659af34bed154f0b70a10b94919e1b249fa14b674fa9. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/FR2X42528478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05e0e6db9c6db7a45562ff88a9fc7705e5f1e55e3530f5c8d6a08ddb91beb93. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DGA0T2465995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4979afcb146a29451a0225e637d8e3813a6a5283b745b053f3bf52d62179e74. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/FR59R2524812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391de16a6a8638e38dc66abd59e6ab1664e998d266f4939030efb05093824e5b. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/FR59R2524813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d872d16e2260b823dd1fcb0d977fa42b170666890d6855464fc6ebc5519276. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/FR59R2524814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1237c3059e9a738d799d48ab860f3772aa5b388c55a171ad4ed31bc9011fe6. 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/FR59R2524816.