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 0x2abc0d4523be6ad7a7414163f3ab6960b6e990202e434af26b24a5ab054f9da9. 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/9b3d7ca9-6d18-4e6d-9122-c7f307fb392b.json and https://artists.proofprofile.net/proofs/artist/9b3d7ca9-6d18-4e6d-9122-c7f307fb392b.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 0x0d82760a0072b83a7a0a7066a3c775d2c6e810d4868f584733bdf1367465532e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FRX282312598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c89344cf2966896892b11017f57323c09764dc16beac9bb7259116468b4b9e. 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/FRX452325479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193154be852f1657ee9713206648b8c1f92d6c73d547ff13aabe80a4625fc9d2. 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/DGA092399697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf294f4c67527dc489b51ef79348a16f21ff4e1cc23e5b6564cd9bcdd5ae00b35. 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/TCAHZ2433277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55deee498b1b31a30932652099fb37e88ae0599d62a3bf9725b5cbd62a2b087f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAHZ2433335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44be3abcf518cc7f2a7bcb4fa4c93f2e6d84fb100bb0c30b1aad593d6de1cc13. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAIE2479724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f95949efe91c33288700c4367d61321e1b3eaa37de75e5278315edf80fc0d0. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/TCAHZ2433386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c4f325610df86d39aaadf6617631d6050da86ead9eb9a6bc4e5d2aeef96997. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAIJ2403817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc029bcd33aa7ef47b29669046d9b02d466f8325f8cc8b26e57fd0b75b8db32. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAII2403750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3874274d5044e8650eed820c2eb458aa4be6be277f24bdf11566fbb5ca65076. 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/TCAIE2479763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e57a02bc1edd9d43af81dd49db8b5e372d5cbe29e4f0048a358ee40ea2d0fc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAII2403885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633ad7d826e2dc873468e5178d8f89831bdc027ce1ec7c3f450a89d67717ee01. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAIB2470589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e5986ec19c16f324059cc40e291d791b5fab2f27e5fdd53d4945372ee8e21c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAIB2470646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927a51f286bc75d3d531abcaac263634269ad878c234097693734fd22c2d49a2. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAIX2467476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16cb4de81704223e308da7abb70e25beae128c2c2ab11b5a65418955d47eb26c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR96X2599220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a38db0e630ef7ac1a3f45db2c0f3e5da0b1ad6fcf63d7272bff186b433d136. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/FR96X2599221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a05168742beade933d089242b4d6b7df4814305c6e88feda27eb2949d4b5754. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FRX282565354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a38db0e630ef7ac1a3f45db2c0f3e5da0b1ad6fcf63d7272bff186b433d136. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/FR96X2599221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8584418051d172df4c819630dc7cd80ce0aa7cd6e76b418bdf61cb4790846a14. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/FRX202560019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b0f7a54e64bdbe892ce2024b737cdf7caf7690ee4e67ff64e043c7b0671745. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/FRX202560020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd53ca493339af4d4718d5edd16e590508e64f39671d1d98fb01bcc4bdf36aa4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FRX202560021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d289c7f533d8ea11c868c7c9d233d642169021803adc40f3118488bb92c1f7. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/FRX202560022.