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 0xef7365738c7601825e02c8160371d8300e4efb0cdbced5ab1a03a01869ef1e15. 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/5b1b7806-b87a-4708-b32f-8b0b5881408b.json and https://artists.proofprofile.net/proofs/artist/5b1b7806-b87a-4708-b32f-8b0b5881408b.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 0x2f3ed9d08cd1e44b1136da6125ae39ce22322f45e9a2ee7ddb16733e52555ee9. 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/USLZJ2190834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66a0c519afc3699991a969abae8a4ff3b3b58683f5313b04fc455233bda5ba7. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/USLZJ2190836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df2474ea4482e6682faf347852c37d749f6c79eaa793908193bf53a8f7e33ac. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USLZJ2190835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ccc0d1d2c563cb3dadcb124bfa6d81498c2095dc5ba1b2bc59edac48a58ede. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USLZJ2190837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344511c9b87dcc59112b5c28f072f41f5689cba44668a347ec305a0449840c0b. 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/USLZJ2190840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbab0a00d50f953a127da5c8f2507fc80d06e8fc9c8d0abe74bf2820dbedc555. 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/USLZJ2190841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc66871cce2ef592caf14cd62e61ed77c61fa64798e3cec39839f427bd5d76c3. 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/USLZJ2190844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a1b068313898e273f09bf9acd5dc390b14c57f72c65d09ca03f1dba5d8c0f8. 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/USLZJ2190845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85072d4cbcaeb27c7e354f11e29930dd2507ab3e29e9ee992a084837ac6e847. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USLZJ2190847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecff92b420512ccb4c928de6ecf93188c35cb0460471af9d9f01c0c07abcbf91. 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/USLZJ2190852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd003f02681d77f3ddc043881210e499fb6456fa1b19e26a5c65db4837dc02b0. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/USLZJ2190853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffdcaeec6742c8c8d6315ed5f7680ae5e122b7ee392c98d7d4503a574f5f37b. 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/USLZJ2190854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c139928554dc2e3bcc24dfd65fd4af8f8e7bd416af9641ba7eb8ad53ad251c. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/USLZJ2190857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3692fdb4322efd60931df3e7612716f0d9db821729e72d6340c909955b1308ad. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/USLZJ2190858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544ecea5bcf81838c610c1437c69dec66eef80d54018f2aa7053790ebbb536d1. 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/USLZJ2190859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943dbd0d0fb9240b4800cb015c8420b2cf4a1ce898af09736721f18beaec59ae. 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/QZDA52267170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f973fa05808fa2655040c5b524580ac3f02560040a1aecd3b6a727a056857f. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZDA52267174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f5b08b8fc134a4e89c0d0821846749d12280bf9f52882e22ad6aff57e1f555. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FRX452401704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a230244652a66e5472d452afeb8f811553e6f9213364340a7b94cc30333e71e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FRX762402049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d728626b084e245f2e7255d769a70b85b27bd7f36f60755562cc6dc30bde4d. 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/FRX762402053.