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 0x453d7413c7be740fb5f0a39f82c4749505764fead1304b4f9cb3bed20f030cec. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4616bfd-2d21-4b61-9d4a-00d4eccf85f0.json and https://artists.proofprofile.net/proofs/artist/f4616bfd-2d21-4b61-9d4a-00d4eccf85f0.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 0x570df727efd1d815e9462fbac761bcb760faffd03869f3f45d3c5f14de207efb. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/BCBA32400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb78c70b8f9e30d95bbc1fcf1014fb956d12672db55ced2eea509aa20a23d6f. 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/BCBA32300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c24b7589709e19b7d4f87cc23a012d575e2757883948440f7fe2d5bd300675b. 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/BCBA32100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96ce92e708bd8f542e19496250bf94e9221af4fa8cb9c23f3406340e8b72040. 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/BCBA32000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1082aa4e2322c2f930950ee5d0105fce8201f3b93acd23c05a5cd77b61696001. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/BCBA32000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8e1bc202f5ece42405fee8e997213879e814dc4452ec339d805ba4daf6bd64. 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/BCBA32100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468d2958fc43ab4773b60b8289d1db16175950e57ea48bc6a853b811d3fce099. 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/BCBA32100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a469c11faf77ae465e546b2c3d836230f66eb156b7bd32e2dc07ae75e62033b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BCBA32000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd541d2f91397e28f7d33271c319bf9b1447e444158d8d58b2e7e0efed9a29b2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BCBA32100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c827644206db2d03be6a7fd1153fdd8eedbed460ac787c88c5350a7df2eb6ce. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BCBA32300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5a679d94105c184adf87da5db75ab75826fb959933debc5e11aede9ba46015. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/UKXN22242680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb361f6c86a8dd19c2b6c90996e66937e269480d0103ef2c61b5fd7b2da1a56d. 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/BKCQX2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbc17e33199a57fad108c1678bf9b88d6e096681e5f371084a0586f7164eb47. 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/BCBA32400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7aa08ffa10d7e7aca4441e888841d6f3ef31f4a1573c7f008c365a6806fea50. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BCBA32300008.