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 0xc97c4fdf463feceab5f53e989ded000d19b79fdf55b2feaca54643d23112f2e4. 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/9409772f-59ec-43c7-8102-6a59a5f3bc6c.json and https://artists.proofprofile.net/proofs/artist/9409772f-59ec-43c7-8102-6a59a5f3bc6c.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 0x53089819b55d9c32ac25d773e280f0c195b2cfd804613b597bb3e0f0014e3ab4. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/TCAFU2145728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91877d744ec326cf53a1be8b3955f4328f8c623cb5b799038fb91907002adcb2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAGP2266951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ea801ddd670bf5846409cd48abc96da00dedc9d5db7590c78714d3282cdd9c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/TCAGP2266991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf375c819f662a8c059ee59bbb72479f4eee2720036beca81b1cce7241c481c7f. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAEW2019496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af665e466af4729b0af4630065b62ea341916c554871f961e7b8f7f22c49f9d. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/TCAEW2019511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e39a05245abde9f55474cc6b54a33bc609b94bc3502ba5d257ef814d5b9d80. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/TCAEW2019547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1442828302d45e676f7cb0422515e14614e75aec084a316685222a40f8dd92d6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAEW2019569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7058c90cc4cad7565dbe30a37ea74aed658b2d06b890bd7644f1706c35a6939. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TCAFF2012138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be4b5cf6c7ced410fb75d1d4438abcba5d02957d806170d1012594d0f50a37d. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TCAFF2012147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc1f3c77f509b81c7a4fcbecc316453d0e4ad975cec55702118e42c2e80c838. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAFA2034925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1143e9519874f96c79e4f2608c0d06059fab46eccd7f2fa5a2c7fea3a6a5d9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAFA2034929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071b9fddde2a8407bc7fca9e40afaf8fb991a4a02c630bcd640cff714fe03dbf. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAFA2034930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74aff132c4f3c7009e151197fa18bf38baf2de29001984092fc2f4742d8c4fce. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/TCAFA2035012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6574f9152a33ddb8c0921158c8835e70307a2f30ea3bb64622d278450e7e2322. 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/TCAFA2035017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4904ca6bb7ed8182bd9cd403432fb932b2c6757aeb2e9e949370ad7e45e3d157. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAFD2007330.
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