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 0x22f4cd294b1d629be4277ef515dadd35baaae838c01d95ac57e03034781dfee7. 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/564b9891-c9ea-44a7-8e25-e1ef8e15615c.json and https://artists.proofprofile.net/proofs/artist/564b9891-c9ea-44a7-8e25-e1ef8e15615c.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 0x732e79a69e3e1ec56018f00bc43b20ac50f5d939e3fedd51dc5b0df37002a7b1. 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/DELJ81614574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70db88ad0ed91a8ff8c0a851bdf52ce72b79e56499c4cde466a7272a06458286. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/DELJ81617433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb354d4e69ae4152355195bb5df007cf2c8a8f74887f71ee4fba9c05913fa8417. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/CH7812057939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a44b80df629f838c8f9cbdec046581b8f1585f1df9aaf3204af7aa8b8e4c2b. 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/CH7812057932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd37e31196c26d1b64bd8997604295a0b0d5b310b05c692f5742f27771871e75. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/CH7812057936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc379db7afebb1be72c82d17e52f7cb88e39d87c83aee9f1787bfc7b40248bda9. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CH7812057940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740eebc10651b84c881d86c8cd0504bea0c52a35b6095053f648524621a3ab2e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DELJ81800972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1acfcddcffe4c44676d948eea20ff2dde378dfd4a2ac92d4a56404ddaff1f7. 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/CH7812057945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9fa8439ee054a72115225f7cc859b7ec8fc87c3fc3a195a5f4ccee10c83559. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/CH7812057947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e84e6fe9055009b35bf97e289b53ba173dbcb610dd78bed56f43130e25e204. 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/DEZC62265892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1855e04b39d74eb8b4498e7c0f930436a4cdfc711e475e9e520f254ceb6935. 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/DEZC62437766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c5daf5c8ee23b3702decfee2d9061da1751466d317665fe666d38d904afd0a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/DEZC62590202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05f0f65c3005c67680d2e7b5f619de9e61d9a2ec12b99f55a9e215bfc0e4555. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DEZC62595443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b81b09e4d4ddbd40b04c0e4d385f374e4abf44c1c6b52c4215736775536153. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/DEZC62531419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f531f8ad9409bb64d5600bc54cfd2c9ff47bb468826bd22b2b29a26582b8e2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DER411094717.