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 0xa3c40a50f8d97383d0468442e4e512826cad00b35b696ed5f6d1c631c45edca5. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/369e420f-53cd-4ce7-a11f-4a20ad462ad8.json and https://artists.proofprofile.net/proofs/artist/369e420f-53cd-4ce7-a11f-4a20ad462ad8.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 0xe97b8a1f374654f9de860be16fc6fb7d716524832a07fe01669471a75c90d680. 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/FITTS2100044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0618a6750e745844d121362cc6152870a5c62eb64a633b515542b4151d00f2. 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/FIS502000117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513c09701cfec36ff8ae245b761ceeae5953f09e104673a58a002157bb9f0ed3. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/FIS502000118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27ce0c62ceeb00accbb100c30d0e599492c763deda5a1bec1542dfb5878bf0a. 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/FIS502000169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55793b85a8139ba64df38632a7b05543439291d7ebe3d6594981652ab8dd2a36. 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/FIS502000167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc627e4093b54b0924d4ac2e5b6b00bd6d78e5b605f5a396b1606b25aaf67df52. 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/FIS502000168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6dfaac9aefed0efaca4bf46281cb2a1abbf92b54f8dcdb55d437f88a3382850. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/FIS502000145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4041e020c852abf01fdd3d154c88c92422673af3b29bbbccff105a0877904b. 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/FIS502000229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d344a3fc82673c42c7261c1ab50fb2dcfdfca1d4ba7044d61c67b15f2866e1. 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/FIS502000238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78ba7c01eba6ade9b31f305b9dad36d32cbed4a1a6dd5ada999557d25a498e8. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/FIS502000241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a542e606e94d0817b94429227b0cfc5d36df81930ead9afcfbb8d01c7efde6. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FIS502000245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d694a2244e07855410b478437eecb05750c05cb9b5852135b2af6d89e2ebc57. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FIS502024314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f6170d14a99bacceb5838cf8cf8b20953624abfe94b99482a2561bbfc467b5. 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/FIS502024334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c5dc72122fec476ec1d874cae9244c8dd2aec81bddc5cc325685fd88421450. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FIS502024335.