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 0x8951aabba0214c199cfd359ddc5d12665b26c9bbbe339fd9010206c2801edfed. 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/39a964a0-d863-43b1-92b8-60b68d101558.json and https://artists.proofprofile.net/proofs/artist/39a964a0-d863-43b1-92b8-60b68d101558.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 0xb847cb7f3208299086e978747b6aef572fea0f1f9a522628471a04241f30f5a4. 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/SE5Q52200484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde675f00333bb8cfbb48cb56fcbd644a681fddc94e918cf090902e5e810e2324. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/SE5Q52200504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6e639258cd3dd627ce3a88e3560f45f5818299f36e66264e91a62cb26aa533. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/SE5Q52200435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c33c9c4dd3082b3e783f2e4281a31e4694d9af8687fbd91a6e5ebef0b72005c. 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/SE5Q52300163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed6b2ad5b29c89b96e5550eba0944a63d64d38b02d00a031ce9aef122672f4b. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SE5Q52201535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f2676e4a4dae653f97997c59870f29de1fc262a0a693e23df605f6a51a3ae5. 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/SE5Q52203059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb951e30a36a01bb66db38121bc025a61c56c65b1c771d5d4440650c8fcfa9de. 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/SE5Q52203054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba7c9d7680551552321eaabbc677d8228397ea5aaa68848dcd32a1a81d48468. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/SE5Q52203694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230710d0005871e6ff785c447a7b0a421d3948b7d8a404b86e00a425047bcc07. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/SE5Q52203852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7671a63f6ecd439b50e4d7d70bb5ce2f4b31f248982bf2128f88460617613c1a. 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/SE5Q52203685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94cbd76791b3cec5a3e236b040bc0ade16770ccba0f8a78a036961a6928a0bb. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/SE5Q52300154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a99dc9deebce30c0c71ba45a95e19cc198213abb29f1e8421e3ccdfe8f2238. 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/SE5Q52300157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae01cf1970f75f8388d5bdda99593e751a8f762fa4376d25b4564e2958a0832. 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/US6QR2400115.