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 0xd6606fd8d0f337ceb31cb3c15f84d7f41b5741b8a9357fec7e0678f7bef1a200. 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/836f4d10-22d8-4970-9ca1-14f4fa8a3efa.json and https://artists.proofprofile.net/proofs/artist/836f4d10-22d8-4970-9ca1-14f4fa8a3efa.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 0xa6d4402119938621af3d32a11af5f4bdfc1003c3b87fd5cf445670385a6661da. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBMA21809345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f048b0f3719820fe9315129adcafd531db201d8321907a7317473848b0d793. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBMA21878494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478d7c7e5174d48a9b18db20fad7ddb5c2fa9647dff32f202dc45920e50291c2. 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/GBMA21878508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe246927a0140c523fd50e84a8cd2ccce630c9f1fa45cc8e727eeec3503e2eade. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GBMA21878515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb16453ae60f6a86e3c696e657366acdd20b2ab1248ca78f4d868c827f9a73b7. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/GBMA21958084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52dc422973a74e4d9502c0c76b9c7b5699a97e9439a08de608049adc2b0f9fc. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/GBMA21958206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee51f853497c785ff03b6f264cceac770fab7aed2e1d0a3244bdb13905d4a053. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBMA21958480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b422a997de5768a9353d5201f1902e36c7510a04ecf9b4db9a139419c052fd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZGLM2260752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4799e4b2f6fb145ddcd067533b71b97de1f8c127d3f8dc7349cf6ea4a9bf30b9. 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/QZW9M2260669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d73f67852ff7a6d122993b18678215eab1dbcb2a55a5caaf7285fb219d13df. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZW9K2381643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf3e29e10e6decc4d861f39d59775148e1a3ae357c912279157c0b572392569. 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/QZMZ92524226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e0b33ec47c6e62638aeb21265444812812f2d2d4f2253bf271f4ad85db049e. 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/QZMZ92494182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1cb08db7b9354db3af1812ab7e5a236842f0b14d0db7fa66e68c91ea754f27. 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/QZMZ92529050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d73f67852ff7a6d122993b18678215eab1dbcb2a55a5caaf7285fb219d13df. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZW9K2381643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4799e4b2f6fb145ddcd067533b71b97de1f8c127d3f8dc7349cf6ea4a9bf30b9. 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/QZW9M2260669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b422a997de5768a9353d5201f1902e36c7510a04ecf9b4db9a139419c052fd. 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/QZGLM2260752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d4402119938621af3d32a11af5f4bdfc1003c3b87fd5cf445670385a6661da. 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/GBMA21809345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d98c32a8faf1902f586a58f1330a0c726607ea8ac2a48c245b5e317d1f550b6. 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/COC012033542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2936325be55e7480e776c8b311cfbed6880317dbe3fe6b4a274af53889dfa439. 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/QZGLM2551599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea579ed422cc30bab86a0adc10b20c03c1a3c10d90d215d50591765a46faecf. 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/COC012034116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749e2861fa062440a48b5624146e4de8480a564bf18bf33ecae55ce54556f49b. 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/QZMZ92529051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8870eb5466523f69fe1efbae28d5118a9dca9dfb7c6248a02c79415935013045. 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/QZTVM2476708.