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 0x0803e119f5f139f10b25d5c5da9fbd4569570aa81c9cd5025961465ed374effa. 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/ae03fd0c-3d10-462a-ae34-9f3ab1f2b69d.json and https://artists.proofprofile.net/proofs/artist/ae03fd0c-3d10-462a-ae34-9f3ab1f2b69d.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 0xe7bcfdb15b6bdb6bd2d26073f0aa45e8883640043bd0aff6e18902da2a2a5991. 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/DEG931912591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162f2b4f2a3779ba671915770b0856a0bd03511074d370c27cff0c2c69371864. 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/DEG931912541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b3433d18eb91781ed41370178760b04e19475fb9d79e2a2ea6fe5002fce985. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:00:45Z), 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/DEG931912501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6250eea78a58b92e2c007ab1a98ec963391b4b92ff43a10f82a4ea7943695915. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DEG931912506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a6b0aa448c00cc8759f460856c454f0dc4f50f5bbb1123d51741f423548df3. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/FR59R1941606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3e5febedfe0835e22c1db4480bda1e1fd48155a25bb765f86be9368093acd3. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FR59R1941609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cbfcccb36d0771c6ba21a41b05b9b81644b5f516ed9323cde4ae976aa5dc10. 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/DEG931910569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2582ada317086aa598dd22271e10a3527be9d7d32523452a2804b1f15b98b5. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEG931912564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13796a5cb1de47765c138c918cb07705783a2d43c18d6157e2443e700302e8f9. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/USYBL2101702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10804ed8b09912e6ca380dece89074acd202e0fa77f2f6af47f2c64489f33771. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/DEG931912393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1469f5020b8777a029f0241d81c3bba8fb2ba82fd627c56dea8b0b75e2426d5. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCAJP2599756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01514e69d8bf00501c298a4ea2fd139c1847b330785a51de2d582ce4fe60be0. 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/TCAJO2599760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b77a9a8de2adec58983f829a722fdd831bb5e6d02c8b5c174dcfef652a0a23. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/TCAJO2599792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2edd0b0711a1f58be93704f60620b71aa1475eb2d8aa5e2dda00e2184463c3e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAJO2599824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf143d9a00654d40e091ce3f32f3e588bf0bdc1ea0df9344704cf7d871204fc98. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:57:22Z), 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/TCAJO2599838.