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 0xdc80db0526a663b4a2f232ac231939f0af0d5d46838ec8b006ef5dd42346d606. 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/a6c5eea0-d2a3-4c47-abd5-656294b94619.json and https://artists.proofprofile.net/proofs/artist/a6c5eea0-d2a3-4c47-abd5-656294b94619.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 0x5e27bda215b47d835eb3f3597d485104e559e1b14692b45c47a683a11a8aa6ad. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:26:17Z), 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/QZFYW1923068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7e433af5fd90f2b9dd0e82226b33a559947aa73c13fd428014b04a15065d44. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAGO2229939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0bdb6d7e2899622222b3f303470903c2e417f06cda7abd82a1b8a6c331533f. 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/QZTB92368260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a66f6b7026d0087fdc3493f3059e4c0813da7570d74f4463bad757fe3cbe3b. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZTB92368265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47942aec432665118d2e28cfd183a9d6964c49c60a3133e3ba65e3cf545811ff. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB92368266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399c4754dcfae06f6240e58f8a29aa05d9ed0679f52d77a334cb49acf9b0a593. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB92368275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2c82a46d32de7f64b20feb300f2015f4f1af5107b90fdded2f071c34165ae1. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:50:21Z), 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/QZHN92466479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c577b43006873f0384dd575aebe07923900c7e3b7baa046380a79b095c181b. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZTAS2448934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e5a81b099882aaa537ef2ab7035326880f35722e7bc18d4ec90a3b64229aa4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZPLR2432630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0bc63a8a82167ef0a783d04d84b7f265810a1330bc130bf0741d4ed548dfac. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAJB2476244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bef0eb60244e5820ad4514737ad713bff71d3622706bc9782a3de485f92de29. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/TCAJE2512696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a274b9b7a426a9001bedf63c9379046c2bbb8fa9416d95c2c3d8cc3fd96e17c. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/TCAJS2593736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1174dd5af708391403371451378da5cb2a2cd9f14acd8e218b1d348a5aa97403. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:24:19Z), 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/TCAJT2520312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b44d784229bbf97c82016a3cb2518ddf8d7da345acd611fe3dc1bf3b9757cd. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/TCAJS2593796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407945021eb33de136838d1e71fdda17a576fdb6b7988623cfa2be95190478ea. 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/TCAJS2593814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea20f2c0f23abbe294a91254e97e9790730d7cf83433b68102ce8b003cf0e42. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/TCAJS2593871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31998c69a3d6b8f1b138863f070b63d8594b4719164f9f709f1f2200ae7e519. 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/TCAJS2593947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a868243891cacd773db94812ca05a1223c073626d0dbf4fe9bc915be8ed654. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJT2594020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9b8bbb6b9729b124e6737edec1db783c7d81fd16a364ad299e7ab7624263a3. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/TCAJU2594744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62c190cb508d0ddb36188b871b22e670f763a149924f853a57d986b14f16071. 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/TCAEL1903834.