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 0x71ddda6c739583ec2fe0e28b9bd1e5b8414865fec8e3eb8d1a8232b078135129. 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/979c9ec3-6223-4678-b873-701d41ca0cef.json and https://artists.proofprofile.net/proofs/artist/979c9ec3-6223-4678-b873-701d41ca0cef.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 0xb52fab3c84a099a1c4666dceb0cfb905e5d3ff3e932434a677d1510d944ec5c4. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/NLC249800045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ac4ba8923b360c630e6a63ffc6a35aedadc8dcf66fd30c4f591b470691b4eb. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/NLC249800046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2595395fd6fdd36621facea3712bd5167f6d717dc1b64c9ab100c23e19b9fe. 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/NLA800000150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b088294a0ebd5d72baa3d4edfc6794b9941fe07349d6623dfae0d612a81dd0. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/NLA800000160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6bfb0fe8574d1797776d6a54f5bc07a05fbefda4c80bf3bad78df8fa54f3e0. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NLA800000154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408fb51bf8838e4b763197a2e057cf644f262b7e2615a27e1f34e886d686bf08. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/NLA800000169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd84c9da13d7795b8d7aa61086ca75d75c82a6daea3f2dcb80a395326bdc8ce9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NLG661300198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7ff44f63c55bd6d941a366a39b8dbfb80d320c53e67644e0bfd94781e67f59. 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/NLG661300199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9f88df91ee16c8e124576cd8e8a9b7841fc03e850e5018e61b61de5e92ed1d. 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/NLG661300202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45dfb720a05305988535a4638a404ba198d388682b1907051d1646625cec5f3. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/NLG661300205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a641182053d43d176b6442136f6ef1bfff773b16a001d029afcbf79b8bb467c. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/NLG661300206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e62b5495b1d71c26ecb2dd2e8f84b09ce341183d9595cf8278b96c09aa18138. 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/NLG661300207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9927ada65f062f972e17816d93197bf47759952d740859cdb1f780156387b60. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/NLG661300210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498b02f0a1d32d861dbb980c3527e0c3ab303f3b64d01928f80d35fd7a3c9e3d. 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/NLG661300214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792de0a32d65f83bd20ebb9acb77b6765ed2944a97da841c546f2c160631cd04. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/NL9BS2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4f3a31d1f182f0645c261a17b64d824de25f27c7943a8bff59ffe11415d275. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/NL9BS2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed54d2e94422857811fc075169c65ffca87f1c8537999235036b157f16ca7b5a. 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/NL9BS2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba813fd31487564f0b571d20af4071e0900ea7228e894291891e60a42e50fbf2. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/NL9BS2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92b5743f185b9b099075980f1aa0f23ccdce657bb72ba8a9e9ef61427434ba9. 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/NL9BS2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9860e57afdb8cca9f97c3aba0ca834dbe1ab31398d865c3479eb560ae5b389. 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/NL9BS2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e7cea33a527518d49c4ce9b81bae38ecd69ebf42f8043d1f818f77ac74dfd1. 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/NLG661200335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e0183b22afce2b1e3c9a5e77ebadca3b69f9e1dcbfd0caa564fe8cd8301eb5. 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/NLG661200339.