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 0xaa302199e0fe6e60c2d3fd9e7f7edfb2c79c530605ef099f926622a1ab618898. 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/6bd5db6a-a16b-4ffd-a840-27a27fd74dfa.json and https://artists.proofprofile.net/proofs/artist/6bd5db6a-a16b-4ffd-a840-27a27fd74dfa.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 0xf2df8f3a00ca87fdb49bea03aa2addb6d6114eda55749e9a1152e80b96856519. 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/QZHNB2052562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1254033967471a8a71c60272dc912d924dd133f220fbc501cbbc7a25beabce92. 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/QZHNB2052566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559382a11ceaec65c4f6c4064a82764edc6e3326f839e6ccfb73dae38f94f2ad. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHNB2052563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52560d13fd1a2e26883fd853687281886241cb4741e339bab7c5443aa8e17cd0. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/QZK6Q2078619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd250f53987367de7771d380fe1541dd61f0f2169f83b2dcf6d28573ad342bbde. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZK6L2370453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1054321f12b39e7002fa58818a8fe21ab06cd0c60bd994ec74a40edd05460708. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZFZ52151033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd532149be84e645253c4ab28efd0f44703fcba9e2d7bd0dff8de9c1248fa05. 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/QZK6N2186065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe821de9698cae7c30b3b10d6a7988ebbcd8a3817a821c6e49944bea2d174e1e. 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/QZK6K2272998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dd6d5e64867485d1c318e8622edebff430756e88e8113a0d7a712f65ebfb3f. 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/QZPLR2298607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6241e003e62b6a607cf9cb4bab6c250e790dbc7b01e4dd18d37f1f8f0136644b. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QT3F32455563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a0ef6b0b7518ffd22e8658aa0e633b661e6454bf45a5505d998a797f14d750. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZWFM2396256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f46cf2ba1727f297d1b8851c0a9a6e1b793c02982a7fdcdc6d18fd4a035b111. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QT3F32455565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41b2d84c70251369ff32561cd5bdb6543d11c8ab9fa3f564eb7ae3df269a2a9. 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/QZTAZ2325168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4af7b4615fa5d246e367706b7f4e2194129c8b2fa682fc2bb44f10e96c5c10. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F32455566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf498374aa9bde6b139b1b99bee073c838511d605423bde332baf56a5663f602a. 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/QT3F32455567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcc76a7118029d38670ff1504b7ed23e55c2e0b9954a1f034659e06aad7b4fd. 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/QT3F32455568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62a9bee50c33d198d5251624d5590835398b63c8ea2dd6cb9a21c3d7e81cdd0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZHNB2579865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba96c8f8d39e5433a5853e2f1b064502aaa64a0659b7334999e27b584c77f5a2. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QT3FE2510368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44d21571654a167051a6b1486631b74a703fedfa4ddcd296e8e4340aa30dbde. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DGA0Q2438932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44d21571654a167051a6b1486631b74a703fedfa4ddcd296e8e4340aa30dbde. 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/DGA0Q2438932.