thumb|Trumps of the Tarot de Marseilles, a standard 18th-century playing card pack, later also used for divination thumb|A 3-card tarot spread used for divination. The deck is the Smith-Waite Centenni
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05701381751df0c30eb536aaf7228b41589895974bc525fa74905851250adce2. 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/0d3a45a8-b8c2-4ce9-b810-0875688c6545.json and https://artists.proofprofile.net/proofs/artist/0d3a45a8-b8c2-4ce9-b810-0875688c6545.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Suffer Our Pleasures (International Version)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b71f09378575847ec973088be8936d7fc6456552d1e4292323f94d3b1cca33. Chain 2 (Bitcoin): anchored in block 956405 (2026-07-02T22:22:35Z), 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/FISFS0300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835ae5265a5cf88e77312110f71153b00950b63860f850b81b5069fe69a981a1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/FISFS0300066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a30760503caa6bbed7a06853929c3c979c32fa48536941dd41ea908cf56958. 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/FISFS0300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa02ed2cef9e02ed9dbc6e5288041eaa07a4e17eb03731a8768e9e9f75da44fb. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/DED830695802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0e67afb5f7e3999334d16b8eb9b1bf7abec23b2bac6c46ee3fc6400f979bcc. 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/DED830695805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fae1ca482fc304fe15f5811d3acd6522e109afdff1f312a844294f0384d3c94. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/FIBRA9400204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1daff6ab1198422233589f12dd34ed635cb2cae5946df8a3d8316cdc7fbd5438. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/FIBRA9400209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11b4abf85d6b3ac958481a2bdace8faf40e80e353c2b230b76e6362d04f7b12. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/FIK5F1000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9773d62c0d7b939ad9bc0599d8edcd5caa43e83f2ff6c3146dd98ef7e8c8b9a2. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/FIK5F1000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e52a0f89f76317db35ad6796802d421fa9f6c23c29e30d5ea7cb8ff20481d5b. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/FIK5F1100001.
Shining Black: The Best of Tarot 1986-2003
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c0a11cd9055891e5dff6d0aead6508991b6c5833148b0e3dd1e927529e6040. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DELJ81749792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b8c55c18b95779b882977793f954b517c53d63de646c6d501fd0a2d1479b56. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DELJ81752877.
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 0xc9e389586ca41521fdc26c42e0b5e1e80018a7a1ba926853d7fb455a0b6019d4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DELJ81813480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48d44dcebbfad085a637cc6cd2c6e013770184f6c7348a8306895e7f623e503. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DELJ81605689.