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 0xda02efc85b5e75789d4bcc4c756f7c356a6c74b11c1f3b96e1dbd8b78065d5e0. 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/5f0b2fc3-e1e0-44b9-ba93-7219ed023d32.json and https://artists.proofprofile.net/proofs/artist/5f0b2fc3-e1e0-44b9-ba93-7219ed023d32.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 0xac50d8a453fc8225df9bc85ad9de5c0c691ad333c683f6faa3650f97f8a6361e. 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/FRZ132407070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e081bc98aed046ebbfed10bcf5cdc4ac6202661e358beef70ef218d3b307b6. 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/FRZ132407010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e72401ad7c39a2b5903769efe3d248d4302b2f34c636c2fe765f59b5bd209d. 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/JP92N2499197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe0940375676334f20afd9ea775b85946450228ebec4828e4b0708fa0dda2de. 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/JP92N2499198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e35da41b59b613fb7774dae8f8f9226cab215d170763449f192342998876a88. 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/JP92N2499199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ced4b61fd8f310ce8e437bcd670a77ed3c621a73326e402ed4a7c1dc5fc2f8. 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/JP92N2499200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa748cee57f05b5ac1bb6d838d2a6975433f45e960b7dbe14ee548005d18cee0d. 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/JP92N2499201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f75560ffa91ac0d28693beead0c89363870e47e33ec26426fd0f7e2a3f863a6. 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/JP92N2499202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2a484e9a7a8d65bfc516ab791e525f30f0c18d345bbe54df64eaa129162abe. 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/JP92N2499203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa087c9548b452f3b5a1a44e42ab1ca6f66df24fb11708738894178fa301b3b0. 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/JP92N2499204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c6aa1b43aa4e740cb1708a4aa248719217607797ee28e518c90f6d16d237a6. 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/FRZ132407020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30ce3d83b2a2360e1fc904f70f333c1a0886476e4b30b25606e246472ae2c58. 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/FRZ132407030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80094bf149b314336ffde23bef7b644a2427f80d1a393c46c213e03b942e663. 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/FRZ132407040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d9ffa0e6d87759f1dd7198b61b749f78fe5b29564a9e372d675ecb34977c0e. 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/FRZ132407050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03dff3843ccd4d8f9f9ddcadcade32521eb6dc7282abc40e0b32041635bdea1b. 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/FRZ132407060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac50d8a453fc8225df9bc85ad9de5c0c691ad333c683f6faa3650f97f8a6361e. 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/FRZ132407070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b788f43c32d2d007fa2e3d1eebcbc54fbb3c298958ec8c1a3445dc2bad6548. 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/FRZ132407080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe829ba4a2c6af029933934aac357ede966c13d3f51086c6d96a746f282c660fb. 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/FRZ132407090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dea61ec24d7b21ebcd96a54073166e34b244178ad0b28cd8bb5029264f00975. 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/FRZ132407100.