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 0x6a7e4f2943f6b81c413f2f0d6d3333b5372d715d878cc765cf831db21b37b1b3. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c7b226d-e851-4f53-8cb8-703dfb723b30.json and https://artists.proofprofile.net/proofs/artist/8c7b226d-e851-4f53-8cb8-703dfb723b30.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 0x431ce8ff2e3259373d61c1652cfa2736c0acb5227bb0128bf557ea8d3ac0169d. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/AUBEC2535276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efbb4500ca4d921111a5c64d6436a25bccf56d3ce1ec59e7afcdac765083245. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/AUBEC2535277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36a77627f6cf69ff6cc72678ec89ebf942a27768669e46c259a3f2e09183e72. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/AUBEC2535278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7c053c043027cc2e25a85b45acb957b0567560d56e6c28b386be56928901f4. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/AUBEC2535279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84135e4f61c13ec40dec0367db269cf92dad3014b18f3dd2a76c5ed8da0ee6f6. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/AUBEC2535280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de8d45903400395f8d76bc83bf59140e3ab190ddcfef6eddc21bc2979041d16. 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/AUBEC2535281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6d3b2d063413045024995cdfe567dbd9382065d74569e11c63d910e6e65aa2. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/AUBEC2535282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa489683756ae7a3d751a08e94c2a68f343ccea2dc892bc83fbe74ef1096a25fa. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/AUBEC2535283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148b0c71bf3ae1749a7a90f1cb19e17a797dfb4998b37582ac7cf7effa020a46. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/AUBEC2535284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33da70a5be56e6e984d7e89ac19c630f29c029fc521f6455f895d0119b9a19d4. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/AUBEC2535285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde74bd5ee2bea17beb27368cf7c2ade718c957d4f7ea95c571aeeafd4c61ad05. 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/GX53U2537024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53fa0c2d55da8979ed255aff1b568e46f966f0fbd733698c9bbbae8ad0886a46. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GX53U2535536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a38705ff59a86a02ed2444624c7a615133b1d0fe5364467ace8e4cd632c8158. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZWFX2501963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa361c01b4b5a26c8fc12ab72a86bf58f0a81d639f24740f51d078ee59d3a98a8. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZZ772591923.