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 0x9d9e13db8be3f37d0839cc87f0f86e1a4485f280f7ff135f195136011b2bb26f. 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/cd11b09f-fac5-4ee4-b631-72dc4fb93a14.json and https://artists.proofprofile.net/proofs/artist/cd11b09f-fac5-4ee4-b631-72dc4fb93a14.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 0x8b394521741b57cf42ef118027062bad944f06ea21eea4edd400aebdfdfac387. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKM2L2300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc2fe40e32a18a27918c8f25e8eab2585bbcd9ee9f7bb2f02e9e3ec0099e766. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXKG22301701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a03aed7162ceb15114b965bc5d5ba3a26b2ad69a145f88cf4595731cd4db094. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BKSUV2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aee4ec793fdf2d6b3e91fffbf5333b0520fa8e33d47e58e1cae98b3d331be2d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BC0UT2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d6e3b13d698b7ce7fe227851c916c3cacd1397319272008b5210a20b196410. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BXG5C2200332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa915337ec9f3378699e86c4db8b14c44176802617f6d72552032c4f80313f19e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BXDWP2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5034123eb5f2c5e37428f166bd95b3a0c76c24b284f71262e0ceb95eb590f26f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBWUL2304589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955681ebc95017628c1143c0038b7d3451024aca839b9634ca99676ffd435537. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BRRGE2300652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211ad7a97dc8833dd19cdc6fa3c427dd3cb3a6ec49766fe4865402e87da25ad9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXKG22401385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d67f76f0660465434e891d1127f18dab6b85bb3493880a184825fd243171b82. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BCE7P2400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc437852828a2ad161c6a4a5fe5c685a8d3f920ef6cdcd69ab6790f39cafe32da. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXKG22401176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd2b8a1c4ffa9edfbf424168480b7fd451de3cd875619883d70b0fb12eb4bab. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXKG22302281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a45fb69367c36c94e25d4e27d1360f23df0d7e14e64706adb5926c659e6715. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BRUM72300882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce74d5f1e609134e695116c60af97595a15d549279fe1d0cc046cd390beef17. 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/BXG5C2300120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cc324a317b4061bc2d46182ee9b3d4cce9b193f22c37a1661f0e4252252866. 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/BCDMP2300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc08d768af73b70f832ec688d61d345283c666fabfa933f4384f7d1d6cf3ff4. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/BKGP92300403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5582fc1b8ef02da589745aff65b517dd40328b7bd6b2be7b7d758738a1ef514e. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ES71G2332626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647e766bd39f1f100c1cc7cd63232e1533084cf87ef8cadc030080fcdeca0027. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BKGP92300661.