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 0xc3ca65d7f8b5f2e80dcd2fa93eddd1f2ad453cb4197925de8dfeaae6060621e5. 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/f87c1af6-9bf8-45e4-b489-d0f44362f565.json and https://artists.proofprofile.net/proofs/artist/f87c1af6-9bf8-45e4-b489-d0f44362f565.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 0x81dfbaad1cdec84baea9eca0b0eea6c7af0420832b4c75d83b6285cb82849c01. 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/QZFYY2397303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3a8df7017c9fd4c7c8801e8972b4ea56c61060465e9476017e975d04c5ebbc. 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/QZHN82163378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d349758933bf364705813533b433ea441b62c93511a905f2684b20777054cb. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHN82130430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3056c746db653ca7a5e6f62f7a012959ab3b44b0eab4fe5545fa8ec18ddcd6f. 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/QZTB42264967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68072d5d9af56b8c3dcba6fc8d9621704c041138d8f76f4618be6a4100bfcbf6. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZDA42302675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845f92ff87957c713129045d14f8ea1006b9d5c75d849a5c2e200910792d1c06. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHNB2352617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd2c04d82cbc37d5d8a8a8e2cce364b84adc94ed8f58506fb48ba72a864f5ac. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZK6Q2346765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bed9b688a866676a76e6732f9bdc4b7cd139b974e2d63aa955046b8ea7d132. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6K2355535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7e01b13ee2aad5010716728b6a1090e5361802a66a32a6aaf48cfeb0e75823. 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/QZMEM2362362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc273b00c68584fa17c8dca96fe14acb41ae73c0a2c064404dfeda6fd23dfe6e8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNWU2312780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3744db7cb47038be4f7e5dcc63c5ddebb59ff3692258e961d662e4a99f3e21. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTBD2398088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72cd0561798ad31bb54814a73a879b08fefb437a950361656b39b31a5eb1185. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFG2329959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab05937804f973c6bdb9fb9b7112c03cceffc792f31a1bf7a9790ce77f6653a4. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWFG2459798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a33c740069b4a1cf84f176712110fbe1f11ecdf6d3e48d4065f903c3ef0aa64. 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/QZWFH2475549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1e973f0adc64220cf995351bb2b150b959a4208450dce34fed7ba2194932ed. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZWFW2424378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cc47047e0849cedc0614ae089734cf7a916294f825a5a749cdd5c909b040e4. 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/QZZ7R2410961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5544a4b9c4a2514957a29af5f33ec65f2d983e6804caa45b26494802b0de0ffb. 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/QZZ7R2453424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51e31799e0d3f49d5a649ab201b1d4f69ca1e4437ad4340d4d01629e2240b7d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZFYY2592338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62777cd84bc54f936c4539e1ecb18966333d68afb42c687f2033dadf488d5b85. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZK6M2529931.