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 0x2dfb81fd488724250a1df7e9d234fb38cac1062b2c6c232b5f1f67f2efe6d97f. 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/76a0ddd1-60b2-4787-9a76-a55dc055aacf.json and https://artists.proofprofile.net/proofs/artist/76a0ddd1-60b2-4787-9a76-a55dc055aacf.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 0x829ef06c8f9063287b3c2679ca9b0531e6f4705495f0192336446cebc9a51474. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:25:15Z), 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/QZ5AB1874231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac83a3416eb9558cdcce7cf8a1f0ecdfc28f560c9d57ede0dea6f6411c1a816. 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/QZ5AB2009013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72283b5ca8bbe28bd950ba6e159f1064010a9733442e32aba258a9aaf55219e2. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:20:19Z), 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/US7VG1932932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e5261453764ae1351076e5fe4c9ef630bbbe78ebe846031f7365f88285cc3b. 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/QZES72052657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405574b8088dfc89df89a01bb7df0aea129743605ab9764dce26d7be3738e3a3. 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/QZNJX2003131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775cd4058db9cace735725017fcbf8ef144d69b4e42182b619eef4242a53d7f3. 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/QZNJX2003135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0e9f0dec64af869266c2094cfb13acb16bdea6d537a7d691b28be37a71432f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNJX2003136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269d4e7a12c65f5e436bcd101b2f90e2120e509d7b844165456d8ace283a686d. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZGLS2197429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e8b239c23651ced6dc4a3cee65811c1557cb6ab99525b83b96eb37b2d6508c. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZNJY2304435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f2cfde359a31d122f129ae4865a3f0929e6733446569e3ea9ae387621ae257. 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/QZTBA2387821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286a64c00d4ebf07a6e17aa4a9d96ba966b0a16f5f5c47e6457be58ce42efd50. 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/QZTBA2387823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55890baf9d342369f0cbfa87f762bc425cddfd11e16c7ab124a9b8a2bcb0493. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLS2430360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfeaeb3353dcc9dde30a3cc970c51ad9cf60d34c2f233ac924d3e12fcb7f3517. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T00:08:31Z), 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/QZNJV2492511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922812416a75abfea5346ba47e08a9cb537752abd05871efbb61d444f3da81b8. 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/QZMER2484257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfdb175cc902b539da281ea9d824a102405275e393914bd5e2db76877f55fec. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZNWT2458703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9783eb3ab954f887028fb8e009ea478ae2c78512abba5e36c7c0d311a5ace1f3. 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/QZTB82453782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59972abfdfdf11d3b98845b0bbe1e7aebe8cd75cb63c9d019aaf63161cb2e2bd. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZW9K2477087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6452ae67cff11e5732793beb1d651710eee3790c6e588aa1d01dac193ec9ba. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMZ92512487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a0624bc8643d8bbcb8cde71c5f6be75e655865e4cb73c930100d6a82bad9990. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZRP52515069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520c1829f7922d35462e90719524b18f122e0d096212ad3b04c37471f5dd24bf. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTAW2545863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55251fc7caaa2f245fd65a4c36f1336a5fd74dd4d2d5327d789ad8b7a1b9dcaa. 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/MXF152200280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb6415dd90608a5bca29df1d6bac19a0bff0e7278a0e341814ee81e449fd5e2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UYB282365004.