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 0x5bc294dc6c377581a9fb5f601d8301db4bb50bd244cc67074a61084ab038a9c9. 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/5afe6088-f5cb-4135-b923-0b156673fa79.json and https://artists.proofprofile.net/proofs/artist/5afe6088-f5cb-4135-b923-0b156673fa79.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 0x89db19739dd767f109d50042423364a54e64344833975fcf15b76a88c6e8a9ce. 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/ES71G1745293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9872fb60458aba501c912aeb245e3e0bfdad25e434cfb26305665b4663333a36. 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/ES8241865601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0acec90fefcf84257db1cd46c045d20007637fa61fff6c5fdc0e388e81c3412. 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/ES8241865602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafa7071f2c3fdf5be6185696bb0784fc75bfc9a1dc823ddff3e1ac813332cc4. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ES8241865603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0487e1e7ac800286600c47143928abf71c98229e511d2735d9c2cdb7c55a5a89. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ES8241865604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d273f5ab7752409da0339c47aa100d9e307e28cbb78e1e37d95b1f8a1ca6b5. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ES8241865605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32937258d607b228b0a3c91d705565002e7c4065bcee007c157802f928c0261e. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/ES8241865606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00dbf9062d1364cd5d3ef122bbfc842d00df8380a381b3b1040b09d10bcd1ec7. 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/ES8241865607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea3d95a7fffdec6491bb2d4ad3a79b906c3bbf51d7d1c17972850234ec07647. 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/ES8241865608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0037e985bcb9c0ad85e69facdb586619724a9ccdf5a9a1b931de35a05bf050. 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/ES8241865609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18aa87f2586f7860c43569eff9d1bec0c4c77552849c2d3509ec94a138cc9df6. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/ES8241865610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfda29358544f8391b21afce1460fba7cbb9aa40ec2266b4b5b1cc9f0361267. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/ES8241865611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e10c3f8d642286f7470f8a24c1c110630457e6e2402e500b2a23aefcf8d3ad3. 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/ES8241865612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29cb681c7d3dad5d783825760e3752aa9d23997f8deb0a0575f90ccc17141c5a. 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/ES8241865613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ab059137a878a8c8e0a07f8e00bbf6d27fd50989a3d0955f07c38140101bc0. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/ES8241865614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243345ab432ec2a2728bb86ddc81e9642d047799c7bdb0dcc1585efaf907d3bb. 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/ES8241865615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b01d10d1a8b4a6c9b2faf34c896aa3f8fd0bf4907d10e4f6b9434a2ff67c5db. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/ES8241865616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d21fda98ede225ce7d2719660a7366214fb44d86ef9e8e1409d8a219634be7b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES8241865617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d7401a6071df849aa74cc0a004d6bd9b2321488061e6321888083e87a0421c. 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/ES8241864301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c9d4834a04acb1bcaa01f3ecfcb54b81baa4a3cf757556f6d2f0d612726a45. 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/ES8241865619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f9367f9d7c034e08e10e1d3f089f07f154e07d5d259faf7ee147dcefa8928f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEH741406771.