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 0xe8adc2660a5dee4bba455bfddc4414dac1fd41a1df5e1d1da2c19e49ff186fc4. 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/45fda6c7-6753-4d57-b38c-22ea9e685c0b.json and https://artists.proofprofile.net/proofs/artist/45fda6c7-6753-4d57-b38c-22ea9e685c0b.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 0x45e1c809e0052acab0a33b5f5067e5279d94a17cd0a128f286998e73c25ec4cf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHZ32023139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6a81dbf8a9f6a2b5d7a6ca46a2ed3d7bbb941e204827f7198582a5d0cc7a59. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZMZ92093352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8cbec94493cd68477e545e81832ab910cf1795fe2cbf27a09f62d274eb703c5. 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/QZMZ92093396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77612322212c26a7a93683ce9551645aca518fdfaa67d5a4e1745bd780ca7781. 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/QZMZ92093321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe838423fa8e5e6764de1a14d31512d12916378b9f3ab1bcab7db06d48ebd3aa0. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZNJV2034364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb357560be682a53d1b4a2d0a170e8861c4a87367b25af4f9628d0b5ad38a9538. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZNJV2034446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3500658f10bb0f49bf0c6a2a50ea290c989c9c449688b48a92001e4cd47c995. 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/QZ5AB2213052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a82a81b0c5381c2d405bd5277c118af18db8bba6a18b6374f30c50ba8143e3f. 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/QZ5AB2208912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397428ee2470086ad9af500754649a5853f6376507e60f0a7dfd35499297115b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZNJW2233917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371b2e34977371f29b743be359ec79c2faa62361d5f42832ec5f7a40dea6e80c. 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/QZW9L2388033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5487436e7c148dbb155f082bcf050768d70f2df2334f83ef160d96680dfdac. 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/QZTVM2440350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cc502b751e3d82820ee5fa50f5d7256f00946b5462a50b4c29b5cfa015ca55. 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/USL4Q2153146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee0590c2b0d0f9ffdfa2ab47beced2af7ae74c2d6af93a8cc0826e668d8a63e. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZMZ92344336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5241ffaa4c2edc6468b6d75ee5bc6a7b690ce1880ad90d2bda1fcb1c9c69d93. 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/QZFYY2222883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ac794a6b5e23d8b20480019f6327e011dd4bce4b6394d266119e03555b6211. 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/QZHZ32239918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597c6b53429bd1c263f1873e2cf82bcd2fb33e0086e34b851df9b5d9db90b5ef. 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/QZHZ42064056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6761f4cdb1550adcd56ece6ab4e408f2fd74f717e59883fde611f50e7468b7. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZFZ71917071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99786da122304f8aca00455bdfcca4350d11362f9d9a98bc960324de505637f5. 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/QZW9K2433326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e91b6e6a511ca23bfa8f654207f1bb944e85f831103ba2fe6255473358181c. 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/QZGLM2034283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc388b68e06c134f70af770134246ababc87cc05c131780577b1437f7d78839. 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/US7VG2175199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd152e64058b7e991fd71f959fea6b867303e88bd7ec5471e8c915380915f88b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZNJX2053659.