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 0x1458dbdd395028a41f005f4bf546b9968339e99b2e8b03e4a6ec5099fad5b3e4. 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/c5fbb5b7-8968-4c98-8eb6-a43f41bccef7.json and https://artists.proofprofile.net/proofs/artist/c5fbb5b7-8968-4c98-8eb6-a43f41bccef7.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 0xac37bc71b71e5bd7d6a4635712f120674d21b662e132b37fa17a518a28e1dff3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/INL232454800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9835a7b1ca83662f8a9fed1c63cd73e538694b5bed32b91bfcd3aab8a08eff. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/INL232454801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb6d9f86aa583fa6fa25be674f72437311fb51716e5d4e529c3905bc413ea55. 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/INL232454803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba20995704cc30a4efcad04e94fe215d7574fe96289c33ff957e9cf42e008fee. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/INL232454806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1da03e46e02fc1ef7eda0dbff8065256b7948f347bee4536397a81a3f49e6f. 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/INL232454807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3567d8e512a08dffef3c5fe5166c49f2c49bfc8c91b330000f7e7e014d85f8b. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/INL232454795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558fce82a80b75e605e1627bb603fb04f057eedf3aaffede995d46c650c2c03f. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/INL232454797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79463f856f5c9b7d4000ec21954bee8acd123708efcab6d7f3b7156655d89862. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/INL232454798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f94387f84e0ea0069f8d99d816d6291af4bf948e8156340567781c56c70ec1. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/INL232454799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ede33bb991e2dc3939b5dd7ede5dc5c454b8370a3cf01a6074cc58fd49c7ea9. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/INL232454815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1803935aba69e148a4ff0e560c1f85ad37196dd46b6f88c6a952c63a7f969b5. 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/INL232454817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cd4fa372a57218c9267a1ea0407bd0304046a930a521791101078b950fea60. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/INL232454819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc3037f71ecbb0c2dfab3cf562f208f0b4cecffd20507dcebbe9a6571b56f20. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/INL232454808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cc841ad3979e9705837ea766c00c8295ff655c0822f3292510ba5c3afd10a7. 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/INL232454810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4029533f757d1d535b8c79b084cdb3958cff474f9816a4767059337735f1a3e. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/INP692000038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1a7677a48fb0cfc4da89782f52498495a7f3b81b4371387beea95dbe20edba. 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/INP692000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54d19c0afb2a1921cdcf4c98d6a2349a28076101f76750297306deee0bdf8f7. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/INP692000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5959dd1ae4be37ec0abba048114565192dcddecf2a4aa24b8ab636083b3aa003. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/INP692000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117b6118d0cad345f23456bbfccb2a232d4792b1100d12004cf7ba3865eab983. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/INP692000043.