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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 0x4fe373a7f7c0e68a48ff3b53c6145c0fdf8625552b4799e5bc02cb41fb042a26. 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/6690943d-f207-4e85-a62f-fb954d7a098b.json and https://artists.proofprofile.net/proofs/artist/6690943d-f207-4e85-a62f-fb954d7a098b.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 0x6106896514731b54d3f5442323da27ea33520d7d98c8c21e18c454801e186f13. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DEU559901303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f632b92c9dd9a0077e1c47b189a48c40597dc7f7d34e5430a72af861bdc53ef. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/DEU559901304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0eaa12986640de2c514ad9e41cc14356220078b3c14b0e0d1728556cf51eaf. 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/DEU559901305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf124d0fd646ecf4bc9c17de2d20fc82842f5874ba9b8ca0acd3d11f2d915451. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DEU559901306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8d620b38c1711ea6201eaccd3804f3c55def9e616ced36d2a2fc6022f31d2d. 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/DEU559901307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5d5d6f112f6e9fd0c0c0fd61447127e796d312cebc86d65310cf80ff10dc02. 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/DEU550102802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487d5fb305cab13986b25158fb10979dc30408b48eaaed7423aad183ae518127. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/DEU550102804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c2be2d88c2142be61dc4512701d0891ad3f774a0cb1a55e7f16a4422fb9777. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEU550102805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d2640c21b333fe27c8ff1f2b336a92f0f477bb6a34d97e15b316151a8394b8. 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/DEU550102808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8fe53c8621bccf281e24e7266cd93332a3cc5566cc7e9f0a0aab9e60853612. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/DEU550205002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7eb01b1fc2f3efb719838b74bb034c4f77e8e81104879fa9dfffd9c60f5ce7. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DEU550710202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a768cdb3e3c23ee4fb7f028c4604de353aede2a5de9d4f195e7855069d5431. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/DEU550710203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f1cdaab49318589da0047cda76ab961bfa655d896c2e09096d02af0272b6a6. 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/DEU550710210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64447ab68c2c0ee44d59ef77fc75132cc480957d1cd2dd571a8dc4d3f34ca2a. 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/DEU551213302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10df1aa6cfb1cc80de74166b9d2c85448525b6f91524ccf7349f750410f5e6a. 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/DEU551613901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70f824b67c415d912e4dcdc4cd3bcaa8e76389052c219aa5f99b438b79765c6. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/DEU551613903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cd55d80356909ed72b782af590dbff0511277149e2903e60d12c4dda6c82e1. 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/DEU551613904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bdd89f9f55feec72b1429a786e81058c59ae2df0e0462965e723d19cd8c87fc. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/DEU551613906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471047730a8d03cb8853398d36cffd18ee326b151aa4716833e7d76ca40da997. 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/DEU551613907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632de45e5d4054fc2cbd59fc5b34fc5b7e0d845a12814d478a672c6060c8b1fc. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEU552014702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0e0de92dc8eff40e68c3cabfb8bf59204ff9e44391cc79a400869c5a224f7a. 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/DEU552014703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8360a4adbdf989bbf9241a16a8d777971a55fad1da6922da568701fa62cea66. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/DEU552014708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8dc74a6ed3bee9a983c6ad9f20bfd958ccdeebc7c4e70901a73dbcce07b30c. 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/DEU552014711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8d3da81a17e97cd4181d55b86a51e2208212a0b4096afd8eb3e160df55fad3. 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/DEU552214901.