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 0xdcb91271029988b1f7306f47e137986b10c1313992f4b53c4ef1762b9a09d231. 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/7b022246-d9b3-4b02-b571-f5e22047fb1b.json and https://artists.proofprofile.net/proofs/artist/7b022246-d9b3-4b02-b571-f5e22047fb1b.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 0xa3a25026a3a2d5bcc0306da23705cd29146841a52568c187baa6f43682e00071. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCACF1552303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b15d816828dcb98bfa547ddefec959e8063b31cd75090c9d75b38f1a1408ed5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCACF1514868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156640d0a73ee7f8b281ca4f86dcab8ab68d4bce1264033bf61f33c90e7b0590. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM42K1604314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7796dff8413e0a62fd78c22352d25b6e982d13a712d2ec54e5b22163579d3f82. 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/TCACM1604709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d46882112489b1f36cc02126d59166618beabe98cb50b35fb05c919429acd21. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QM42K1604350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb701573bd76f801211f619d1c15a7e6ef8c56035620adabcbf82cda71e0a101. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCACP1603504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb882ea8e81994171abdb1e990e3907800390574156aedc9678973a8b3031892f. 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/QM42K1738796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61dc68af0150c3f6419aa4fa32fcbf4c89a2d85c029f9dae5d663720ba22625d. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QM42K1613577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427718349dd165ab5fd1d7d8ae9a6ce6347e674b6af6bb37f03c7dc727d70250. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM42K1767255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfbbdef0eaa3a333ba3cfd69a86580939c26a11ec0cbc036202dece111b5d02. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QM42K1728276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64c66938745dbe9a0d35032dead306f6b936fff4ebb81c8781c6e84b9a4c3f9. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/QM42K1742544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba1f463c1c45ace595a74033256eba77de7f87d5825eb9bd7def661aa3f0f93. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/TCADN1850916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3e9461eb61237e697b0446010942005c379ab7be182777ca735cc204cd25ef. 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/QM42K1984375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fffb4d2a225beddc6ea296a8c42f1700c282b972cc698750dd56fec20ae59ef. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM42K1835361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af46a6b54542f0da6559f2afe50c57a8a0783498f50459f68b8ea7990e877d4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM42K1806652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047e207fdc16be764eb7e07c6ca2f2e5e2d19008776e2bea6b332f69765a2e61. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QM42K2221721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0628c5dc385996060b9b3d1e4cfe8570e78920761f651f21b4f33666fd157c96. 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/QM42K2352494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bf22261f8cc1e33dfb85ffec0f8bb50e0a9ed56d5cfe0ce033a443dd5e50ad. 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/TCADL1805626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98eb152f62c62b8bc57ed615680485685531b91a3f9d48b4a1002633dca80b28. 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/ZAVDU2400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274ae6fc31f7cbeebcfc4bf186ee768e7a4ae4180762957934b3b29f500a993d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ITDF42000020.