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 0xe3e978fef921de159bd7e1ac39064d3c2e116dd48c34f4b906645235c04216b3. 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/ef112acb-2d0e-4ca8-83b4-b042573d1b38.json and https://artists.proofprofile.net/proofs/artist/ef112acb-2d0e-4ca8-83b4-b042573d1b38.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 0xff13fdf5044a5d7a86f9a226f0070d6c6b5d0bce3d14f3321c5b4c74e89240c0. 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/ITL091700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e08dc26d9849b4f63beafc954fa279acd3122b3f964eb5a5721f5924d9379d1. 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/ITL091700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd80413b9981d6486734c4d7b44fcc7f296fed688d7a0be81942dc984700c1d. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ITL091700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f55791f4883d40a211c1379cc3e1ac0b2d59da7f1a7c7d2c5b5dc594da5ed5. 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/ITL091700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fab4790e47993b3853a0315ec0f607f390a0cd0f960cb26957d196d87f63b8f. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/ITL091700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a2c8f79a5efd5c2f03f0fd3669df59a0dbde0efee4b995ba5b7ef136af916a. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/ITL091700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61444b6c2d0372ee877e49fea79682afacbcecece426c375c77f558c0ad03d36. 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/ITL091700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5436bf58dcc2402180f6a2ed51838c32f0d4f806c8a377032eb81d6e76a2bc5. 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/ITL091700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28db728e75c54e654809e3f85ae35a4d46142afc48d76f586cb0e40cd5fb6fa7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ITL091700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca23afbd462baf4e1ea2416b6719a46f46e98a7d8474aaa019a53271d871fd4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ITL091700016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc893497e7e4312bcccec229ca2166a2ea351430fa8d18c46d3633c6ddc4156. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ITL091700018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff13fdf5044a5d7a86f9a226f0070d6c6b5d0bce3d14f3321c5b4c74e89240c0. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/ITL091700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd80413b9981d6486734c4d7b44fcc7f296fed688d7a0be81942dc984700c1d. 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/ITL091700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69376b3ae9c5d862b03445dc420d692c3dfb8b751b3cbb343f95170dbbbd8ddd. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/ITL091700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f55791f4883d40a211c1379cc3e1ac0b2d59da7f1a7c7d2c5b5dc594da5ed5. 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/ITL091700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfb03385dd434124c4855dc4cd1dd3f76d1ba2b0058a66d8b03fec5f57cbf9a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ITL091700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a2c8f79a5efd5c2f03f0fd3669df59a0dbde0efee4b995ba5b7ef136af916a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ITL091700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5436bf58dcc2402180f6a2ed51838c32f0d4f806c8a377032eb81d6e76a2bc5. 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/ITL091700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28db728e75c54e654809e3f85ae35a4d46142afc48d76f586cb0e40cd5fb6fa7. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/ITL091700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca23afbd462baf4e1ea2416b6719a46f46e98a7d8474aaa019a53271d871fd4. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ITL091700016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae86a5672672ec6d0f681469bdde9aaf3d8b4b4d8279d1078c8d1fd68c37b44. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/ITL091700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884e19e3f0126010791cdb0040f6cd5c3759205daede30ee6706e6b2d4291e48. 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/ITL091700032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8cf165f3b833ab80ecda6f8aa7be51260504b85d663670fd322451e58cd183. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/ITL091700031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0be11766c1e01fcf0cbefc3615c3ec9d6dcc39595d4da88d91c1801a30a850. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/ITL091700029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdb47c4fe2afc8076a27aa3da63327fc4a90de2f5bf7eb64bc36340de24730e. 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/ITL091700028.