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 0x11e9e23789f61137787fbd7cb294287c22011a453c07ebca55ebfb9f012c5abc. 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/d55a9018-c4db-4b43-b192-7179fc875573.json and https://artists.proofprofile.net/proofs/artist/d55a9018-c4db-4b43-b192-7179fc875573.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 0x42f858c7242ebc1de4ec12f550ac56c6e81c93979c0f37d675114a19855b8c16. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/TCADH1737599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4faab3ee999a72021da0270dc0215a7424a25d55c5be48dc367b726f8d85ad. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCADH1737600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbba16fcdc836ceb9ef6e06afad9eca1f17b1f81597954f86b4fa3f3db884095. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCADH1737601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f36e5856b0a04936cecef2e8a1c42fae9e628ab14ab48f48c1cd2566b10c2a3. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCADH1737607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc234c0fa53ef9ed82fc7b2a419a8d6e660a478d8b01bdc9009727f6faf07c9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCADH1737610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1c715362a2bcf5f3e6aea514a81bfcfc451b16badd49a006b243dd26808c8d. 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/TCADH1737518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56def43371e3db055a64bbcea0af686088ea82b20adcfd0a422a22c9abc2ca7e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCADH1737519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330129371f443a54f0a32deb6d5d74140dc948d66d3eb609432eabe465d5624a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCADH1737520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca253b7917edfe362cb86d8d0338d4fdf7fe6c80ba9a9ecc2afab7b408f344dc. 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/TCADH1737524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1061483d5f7e037a0dc0cdbd0e4e9fcdeafb144302cfab64272d7871f8ca0722. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAFJ2146037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090340aedfdb0d2503624e6132f96469bc9b550ed7cbf3b65a32c13952bda607. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TCAFJ2146044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c964fbe1ff4b67420cd2e74c481e4b43ddabeafd704865707133fec9c97a0d. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAFJ2146048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f940d6eef7cd0fdb5400bff07c648858626294b8a99c4a20030824e95760f6. 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/TCAFJ2146053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf65cbd7961833889733c3fc5ff8838b51702d153dad07438017c062dcc8503e. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/TCAFJ2146060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6427839b4fa19880f2ac4ce8e7c9f51bc56b0f2cc9ef61f45e54ba9ed0a150b. 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/TCAFJ2146064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af15802911d2f8bfbfca201c21cf6924386370b9d93b36d14e535fd7a5e7ed9. 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/TCAFJ2146066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ff4cadc735417d01af956ae5bc0849d3cde1cb520ea93f54d2d5c2a5e6d69e. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCAIL2456471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0cb5559fec1b80731b885e9183bdb556e732ee3b173777a03cc38646b1a22d. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/TCAIL2456587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3083ee612ab39faeb613fa12e85e708f787150b3c18f9dc14a4ffdfcc309a32. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAIL2456628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb65c2a362ecbdfea1fbf4fd5078e78b8e70ec4da8d7a86acff3ce759e9998003. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/TCAIM2456737.