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 0x9a6234e2ea84b1825e487d3c12afb165f7d79d53e14f07c48dc8875714869277. Chain 2 (Bitcoin): anchored in block 954046 (2026-06-17T04:53:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/410dd10b-e189-4441-87a0-8734a7d8abbd.json and https://artists.proofprofile.net/proofs/artist/410dd10b-e189-4441-87a0-8734a7d8abbd.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 0xd6d6c0c08b9583759b3676a9f41376debfd45660af52687fc66b28c4d73dfd31. 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/RSA221600655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71367f483343cd85d71bee28aba7ca8db9d4fa6d64c805bc2c19c16c0c34b32f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/RSA221600656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5d4034c13a4ce0a7d610730c987229ad38370db5ef3d13050196395aca1313. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/RSA221600657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13d379e5582e2e00ae725c2f9fb35cb24bffff26a833668fac61fc1c376165d. 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/RSA222190839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d4aa40a82e197bb2a2a01d8ad5450f17de8dcc27c40fd55be446193b636130. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/RSA222190843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde596d3d36dd39efcf56efd08caf86fba332a268954946f3ef95aceb89f82f8d. 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/RSA222190850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7af73db31a8ba79d4621689cddd6e9fe2ccdd767577313e87d1643807ab30ab. 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/RSA222190854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba941f19b69e1bc0a00091882f2a4a6a1c0169a933689590c8322b885442e8f. 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/RSA222190856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e54c6519c6cf86f8e2aae4b89a659d6da2719a1d3c742b965be3e325ee7d9c. 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/RSA222190857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ad1c0a63ac0b294de0227209eb65a6c60bbb8fac9221691246a8c85e34084a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/RSA222190872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951b71f2f6a99116120bdfc132253a75d78e642b6dfe8803e37eaf1d66fa2cf4. 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/RSA221600520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6de27484aeb1e5501188ada2d76194c92f2a114bcc03a59ae05d433832175d. 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/RSA221600523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983c0a453a46731f879b72a8be80e8e933a41a2ea3d31e36d8e85c3f70f2aedd. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/RSA222091109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf384b06c8874b8e18cd5002b6c0f343b5c572abefe092fb772103927081bc6b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/RSA222091116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec60bfbfccd85b660e8cfb5c41d00f0f7699721e264374167d40a3c688f76f4. 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/RSA222091124.