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 0x4e8c351008246bb27d27c4dac67ef610401b84b4fa794d9da015187439ddd550. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfaba855-e232-4c55-971e-d52ce58c31a9.json and https://artists.proofprofile.net/proofs/artist/dfaba855-e232-4c55-971e-d52ce58c31a9.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 0x2f00bdf93ae714572232d248117df112734fbe3711a7b78501565dcde07775a4. 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/DEF459809329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1df7eb85c915e4f8b44590bf784716cc39fe85eb7f41da90bfa84b6c447dae. 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/DEF459209325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53e62ab8a2bf65854d4b480845190572bb4757ed3514a281d45bfe990233a40. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEF459311104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88226d282dd75c211fe1fadccddbf6fa5fb0b68fb41673c3587c3497ec6b9f36. 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/DEF459311103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4fa77454e40d4a6e0a87c0a3ae73bb5adc7c49c36918b89d6574ed43b669ce. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/DEF459209327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3188aae9e4faa24a95c11a26390d8fcb8ed76c6d9323f7a221fea110c24fb37a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEF459210516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8401ef09483c8d4ec756d9036259c0de3b6aa2aa11f4e0ca7a0e3b572c62098. 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/DEF459311101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd07a9ce576a813159e3c31ee504f8cac84a1f5db9235f7e52a9b8e4c1983f54. 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/DEF459311108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c35db74e157b5628a7930c5d49e425f912b1e99f4c236ad60e66966b81b0f5. 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/DEF459311102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533c17464807a6e5527dd0c5432705c72069d55507c6879e0ac2049e5cfb1e6f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEF459311107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac19b83f7cf3f014b4e4d6d96328efb60128b4cf2183071a47ca1e483848364. 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/DEF459311105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b03fb003c89231bed5f26d3b2db5f8a0e7ec58b4475b4427caef13618e233fa. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/DEF459209402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e254db9eec654926b4e927a84783f0742f6771c5d54e7a5370926e3a3a2936. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEF459311106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0985df57d2634c78441055c367112883e5e35a9ddf5d31a762442009fa272a. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DEF459311025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202e25b0131a4e3917c13f4804681a7fb6ef9222d193f8cfab7b3ff03d9c3b10. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEF459311026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05afb7b1e54cf960d062144a80de204ec7eb66a3aabd718b574d42cda26abd40. 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/DEF459310601.